{"id":21087,"date":"2026-08-27T18:20:06","date_gmt":"2026-08-27T16:20:06","guid":{"rendered":"https:\/\/webhosting.de\/zfs-arc-cache-speicherverbrauch-erklaerung-tuning-io\/"},"modified":"2026-08-27T18:20:06","modified_gmt":"2026-08-27T16:20:06","slug":"zfs-arc-%e3%82%ad%e3%83%a3%e3%83%83%e3%82%b7%e3%83%a5-%e3%83%a1%e3%83%a2%e3%83%aa%e4%bd%bf%e7%94%a8%e9%87%8f-%e8%a7%a3%e8%aa%ac-%e3%83%81%e3%83%a5%e3%83%bc%e3%83%8b%e3%83%b3%e3%82%b0-i-o","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/zfs-arc-cache-speicherverbrauch-erklaerung-tuning-io\/","title":{"rendered":"ZFS ARC\u30ad\u30e3\u30c3\u30b7\u30e5\uff1a\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6b63\u3057\u304f\u7406\u89e3\u3059\u308b"},"content":{"rendered":"<p><strong>ZFS ARC<\/strong> RAM\u3092\u7a4d\u6975\u7684\u306b\u6d3b\u7528\u3057\u3066\u3001\u983b\u7e41\u306b\u8aad\u307f\u8fbc\u307e\u308c\u308b\u30d6\u30ed\u30c3\u30af\u3092\u8fc5\u901f\u306b\u63d0\u4f9b\u3059\u308b\u3068\u540c\u6642\u306b\u3001\u5b9f\u969b\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u8ca0\u8377\u306b\u5fdc\u3058\u3066\u52d5\u7684\u306b\u8abf\u6574\u3057\u307e\u3059\u3002\u4e00\u898b\u9ad8\u3044\u3088\u3046\u306b\u898b\u3048\u308b\u4f7f\u7528\u91cf\u3092\u6b63\u3057\u304f\u89e3\u91c8\u3059\u308b\u65b9\u6cd5\u3001\u91cd\u8981\u306a\u6307\u6a19\u3068\u306f\u4f55\u304b\u3001\u305d\u3057\u3066\u4ee5\u4e0b\u3092\u907f\u3051\u3064\u3064\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30a4\u30ba\u3092\u78ba\u5b9f\u306b\u5236\u5fa1\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002 <strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/strong> \u3092\u5931\u3046\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<p>\u6982\u8981\u3092\u7d20\u65e9\u304f\u628a\u63e1\u3067\u304d\u308b\u3088\u3046\u3001\u91cd\u8981\u306a\u5185\u5bb9\u3092\u307e\u3068\u3081\u3001\u660e\u78ba\u306b\u3059\u308b\u305f\u3081\u306b\u91cd\u8981\u306a\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u5f37\u8abf\u3057\u3066\u304a\u304d\u307e\u3059\u3002 <strong>\u6982\u8981<\/strong>.<\/p>\n<ul>\n  <li><strong>ARC\u30b5\u30a4\u30ba<\/strong>: \u52d5\u7684\u3001zfs_arc_max\/min \u3067\u5236\u5fa1\u53ef\u80fd<\/li>\n  <li><strong>\u56de\u53ce\u53ef\u80fd<\/strong>: \u30ad\u30e3\u30c3\u30b7\u30e5RAM\u306f\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u5373\u5ea7\u306b\u89e3\u653e\u3055\u308c\u308b<\/li>\n  <li><strong>\u547d\u4e2d\u7387<\/strong>: \u9ad8\u3044\u30d2\u30c3\u30c8\u7387\u306f\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6709\u52b9\u306a\u6d3b\u7528\u3092\u793a\u3057\u3066\u3044\u308b<\/li>\n  <li><strong>L2ARC<\/strong>: SSD\/NVMe\u3078\u306e\u8ffd\u52a0\u3067\u3042\u308a\u3001RAM\u306e\u4ee3\u308f\u308a\u306b\u306f\u306a\u3089\u306a\u3044<\/li>\n  <li><strong>\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u306e\u30eb\u30fc\u30eb<\/strong>: \u30d7\u30e9\u30a4\u30de\u30ea\u30ad\u30e3\u30c3\u30b7\u30e5\uff0f\u30bb\u30ab\u30f3\u30c0\u30ea\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5fae\u8abf\u6574<\/li>\n<\/ul>\n<p>\u79c1\u306f\u65e5\u5e38\u751f\u6d3b\u3067\u3053\u308c\u3089\u306e\u30dd\u30a4\u30f3\u30c8\u3092\u6d3b\u7528\u3057\u3001\u8aad\u307f\u9032\u3081\u308b\u8ddd\u96e2\u3092\u77ed\u304f\u3057\u3001\u8a18\u61b6\u306e\u8ca0\u62c5\u3092\u8efd\u6e1b\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u5171\u6709\u3059\u308b<\/strong>. ARC\u304c\u6e80\u676f\u3067\u3042\u308b\u3053\u3068\u306f\u3001\u6d3b\u767a\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u304a\u308a\u3001\u4e0d\u5177\u5408\u3084\u96a0\u308c\u305f\u554f\u984c\u304c\u3042\u308b\u3053\u3068\u3092\u793a\u3059\u3082\u306e\u3067\u306f\u306a\u3044\u3002 <strong>\u6f0f\u308c<\/strong>. \u30b9\u30ef\u30c3\u30d4\u30f3\u30b0\u3084OOM\u30a4\u30d9\u30f3\u30c8\u304c\u767a\u751f\u3057\u3066\u521d\u3081\u3066\u3001\u660e\u78ba\u306a\u5236\u9650\u3092\u8a2d\u3051\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u6e2c\u5b9a\u5024\u3092\u7528\u3044\u3066\u5909\u66f4\u5185\u5bb9\u3092\u691c\u8a3c\u3057\u3001\u6bb5\u968e\u7684\u306b <strong>\u30d5\u30ec\u30fc\u30e0<\/strong>. \u3053\u3046\u3057\u3066\u3001\u4ed6\u306e\u30b5\u30fc\u30d3\u30b9\u306e\u52d5\u4f5c\u3092\u59a8\u3052\u305f\u308a\u3001\u30ea\u30b9\u30af\u3092\u4f34\u3046\u6027\u6025\u306a\u5224\u65ad\u3092\u4e0b\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u7dad\u6301\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u9078\u3076<\/strong>.<\/p>\n\n<h2>ARC\u304c\u30e1\u30e2\u30ea\u5185\u3067\u5b9f\u969b\u306b\u884c\u3063\u3066\u3044\u308b\u3053\u3068<\/h2>\n\n<p>ARC\u306f\u9069\u5fdc\u578b\u8aad\u307f\u53d6\u308a\u30ad\u30e3\u30c3\u30b7\u30e5\u3067\u3042\u308a\u3001\u4ee5\u4e0b\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3044\u307e\u3059 <strong>MRU<\/strong> \uff08\u6700\u8fd1\u4f7f\u7528\u3057\u305f\uff09\u3068 <strong>MFU<\/strong> \uff08\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\uff09\u3002\u3053\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u3001\u79c1\u306e\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u304c\u751f\u6210\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u306b\u81ea\u52d5\u7684\u306b\u9069\u5fdc\u3057\u3001\u6700\u5927\u306e\u52b9\u679c\u3092\u3082\u305f\u3089\u3059\u30d6\u30ed\u30c3\u30af\u3092\u6b63\u78ba\u306b\u7528\u610f\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30a2\u30af\u30bb\u30b9\u304cRAM\u304b\u3089\u76f4\u63a5\u884c\u308f\u308c\u3001 <strong>\u30d7\u30ec\u30fc\u30c8<\/strong> \u3042\u308b\u3044\u306fSSD\u3002\u7279\u306b\u7e70\u308a\u8fd4\u3057\u884c\u308f\u308c\u308b\u30a2\u30af\u30bb\u30b9\u3067\u306f\u305d\u306e\u6069\u6075\u3092\u5927\u3044\u306b\u53d7\u3051\u3066\u3044\u307e\u3059\u3002\u3068\u3044\u3046\u306e\u3082\u3001\u4e00\u81f4\u3059\u308b\u30c7\u30fc\u30bf\u304c\u898b\u3064\u304b\u308b\u305f\u3073\u306b\u30d2\u30c3\u30c8\u7387\u304c\u4e0a\u304c\u308b\u304b\u3089\u3067\u3059\u3002 <strong>\u304a\u554f\u3044\u5408\u308f\u305b<\/strong>. \u7279\u306bVM\u30a4\u30e1\u30fc\u30b8\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3001\u305d\u3057\u3066\u591a\u6570\u306e\u5c0f\u3055\u306a\u30d5\u30a1\u30a4\u30eb\u306b\u304a\u3044\u3066\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u305d\u306e\u771f\u4fa1\u3092\u767a\u63ee\u3057\u307e\u3059\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/08\/zfs-arc-cache-5723.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<p>\u307e\u3055\u306b\u3053\u306e\u4f5c\u696d\u65b9\u6cd5\u306e\u305b\u3044\u3067\u3001RAM\u304c\u300c\u6e80\u676f\u300d\u306b\u898b\u3048\u3066\u3057\u307e\u3046\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u3067\u3082\u79c1\u306f\u5f15\u304d\u7d9a\u304d <strong>\u30ea\u30b6\u30fc\u30d6<\/strong> \u304c\u3042\u308a\u307e\u3059\u3002\u4f7f\u7528\u4e2d\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u3001\u30d7\u30ed\u30bb\u30b9\u304c\u30e1\u30e2\u30ea\u3092\u8981\u6c42\u3057\u305f\u6642\u70b9\u3067\u3044\u3064\u3067\u3082\u89e3\u653e\u53ef\u80fd\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3001\u30b7\u30b9\u30c6\u30e0\u306f\u30a2\u30a4\u30c9\u30eb\u72b6\u614b\u306e\u5bb9\u91cf\u3092\u653e\u7f6e\u305b\u305a\u306b\u7a4d\u6975\u7684\u306b\u6d3b\u7528\u3057\u3064\u3064\u3001\u305d\u308c\u3067\u3082\u8ca0\u8377\u306e\u30d4\u30fc\u30af\u3092 <strong>\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb<\/strong>. \u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u306e\u76f4\u63a5\u6bd4\u8f03\u306b\u8208\u5473\u304c\u3042\u308b\u65b9\u306f\u3001\u79c1\u306e\u7c21\u6f54\u306a <a href=\"https:\/\/webhosting.de\/ja\/ext4-xfs-zfs-%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0%e3%83%91%e3%83%95%e3%82%a9%e3%83%bc%e3%83%9e%e3%83%b3%e3%82%b9%e6%af%94%e8%bc%83-%e3%82%b9%e3%83%88%e3%83%ac%e3%83%bc%e3%82%b8\/\">\u6027\u80fd\u6bd4\u8f03<\/a> \u3002\u305d\u3053\u3067\u306f\u3001\u5b9f\u969b\u306e\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u306b\u304a\u3044\u3066\u3001\u8ce2\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u5358\u306a\u308b <strong>\u7406\u8ad6<\/strong>.<\/p>\n\n<h2>\u306a\u305cRAM\u306e\u4f7f\u7528\u91cf\u304c\u591a\u3044\u3053\u3068\u304c\u671b\u307e\u3057\u3044\u306e\u304b<\/h2>\n\n<p>ARC\u306b\u304a\u3044\u3066\u3001\u30b7\u30b9\u30c6\u30e0\u304c\u771f\u306e\u30e1\u30e2\u30ea\u4e0d\u8db3\u306b\u9665\u3089\u306a\u3044\u9650\u308a\u3001\u79c1\u306f\u300c\u6e80\u676f\u300d\u306eRAM\u3092\u597d\u610f\u7684\u306b\u8a55\u4fa1\u3059\u308b <strong>\u82e6\u3057\u3093\u3067\u3044\u308b<\/strong>. ZFS\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u62e1\u5927\u3059\u308b\u3068\u5373\u5ea7\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u30e1\u30e2\u30ea\u3092\u89e3\u653e\u3057\u3001\u76ee\u6a19\u30b5\u30a4\u30ba\u3092\u7d99\u7d9a\u7684\u306b\u8abf\u6574\u3057\u307e\u3059\u3002\u4e00\u822c\u7684\u306a\u30c4\u30fc\u30eb\u3067\u306f\u3001\u3053\u306eRAM\u306f\u300c\u4f7f\u7528\u4e2d\u300d\u3068\u8868\u793a\u3055\u308c\u307e\u3059\u304c\u3001\u5b9f\u969b\u306b\u306f\u65b0\u3057\u3044\u30d7\u30ed\u30bb\u30b9\u306b\u5bfe\u3057\u3066\u9045\u5ef6\u306a\u304f <strong>\u51e6\u5206<\/strong> \u3068\u3042\u308a\u307e\u3059\u3002\u771f\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306f\u3001\u30b9\u30ef\u30c3\u30d4\u30f3\u30b0\u3001\u9855\u8457\u306a\u30e9\u30b0\u3001\u3042\u308b\u3044\u306fOOM\u30ad\u30e9\u30fc\u306e\u52d5\u4f5c\u306b\u3088\u3063\u3066\u521d\u3081\u3066\u660e\u3089\u304b\u306b\u306a\u308a\u307e\u3059\u3002\u7406\u89e3\u3092\u6df1\u3081\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u3092\u53c2\u7167\u3059\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002 <a href=\"https:\/\/webhosting.de\/ja\/linux-%e9%80%8f%e9%81%8e%e3%83%9a%e3%83%bc%e3%82%b8%e3%82%ad%e3%83%a3%e3%83%83%e3%82%b7%e3%83%a5-%e3%83%9a%e3%83%bc%e3%82%b8%e3%82%ad%e3%83%a3%e3%83%83%e3%82%b7%e3%83%a5%e3%81%ae%e9%81%95%e3%81%84\/\">\u30da\u30fc\u30b8\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u9055\u3044<\/a>, \u3001OS\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3068ARC\u304c\u76f8\u4e92\u306b\u9023\u643a\u3057\u3066\u304a\u308a\u3001\u4e21\u65b9\u304c\u76ee\u306b\u898b\u3048\u308b\u6d88\u8cbb\u91cf\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u305f\u3081 <strong>\u523b\u5370\u3059\u308b<\/strong>.<\/p>\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u91cd\u8981\u306a\u306e\u306f\u6587\u8108\u3067\u3042\u308a\u3001\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u30c4\u30fc\u30eb\u306e\u300c\u7a7a\u304d\u5bb9\u91cf 0 GB\u300d\u3068\u8868\u793a\u3055\u308c\u305f\u5358\u4e00\u306e\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u305d\u306e\u3082\u306e\u3067\u306f\u306a\u3044\u3002 <strong>\u6050\u6016<\/strong>. \u3055\u3089\u306b\u3001I\/O\u5f85\u6a5f\u6642\u9593\u3001\u30b9\u30ef\u30c3\u30d7\u306e\u4f7f\u7528\u72b6\u6cc1\u306e\u63a8\u79fb\u3001\u304a\u3088\u3073\u4e3b\u8981\u30b5\u30fc\u30d3\u30b9\u306e\u8ca0\u8377\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3082\u78ba\u8a8d\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u5024\u306b\u7570\u5e38\u304c\u898b\u3089\u308c\u306a\u3044\u5834\u5408\u306f\u3001ARC\u306b\u4f59\u88d5\u3092\u6301\u305f\u305b\u3001\u7e70\u308a\u8fd4\u3057\u884c\u308f\u308c\u308b\u8aad\u307f\u53d6\u308a\u51e6\u7406\u3092\u6700\u5927\u9650\u306b <strong>\u62cd\u8eca\u3092\u304b\u3051\u308b<\/strong>. \u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u304c\u751f\u3058\u305f\u5834\u5408\u306f\u3001ARC\u3092\u53b3\u3057\u304f\u5f15\u304d\u4e0a\u3052\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u4e0a\u9650\u3092\u9069\u5ea6\u306b\u5f15\u304d\u4e0a\u3052\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002 <strong>\u5207\u308a\u53d6\u308b<\/strong>. \u3053\u308c\u306b\u3088\u308a\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u3088\u308b\u52b9\u7387\u5316\u3068\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8981\u4ef6\u3068\u306e\u30d0\u30e9\u30f3\u30b9\u304c\u4fdd\u305f\u308c\u307e\u3059\u3002.<\/p>\n\n<h2>ZFS\u306b\u3088\u308bARC\u30b5\u30a4\u30ba\u306e\u6c7a\u5b9a\u65b9\u6cd5<\/h2>\n\n<p>\u8a2d\u5b9a\u304c\u306a\u3044\u5834\u5408\u3001ZFS\u306f\u5229\u7528\u53ef\u80fd\u306a\u5bb9\u91cf\u306b\u57fa\u3065\u3044\u3066\u9069\u5207\u306a\u4e0a\u9650\u5024\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002 <strong>RAM<\/strong>. \u79c1\u306f2\u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u7528\u3044\u3066\u3053\u306e\u30c0\u30a4\u30ca\u30df\u30af\u30b9\u3092\u5236\u5fa1\u3057\u3066\u3044\u307e\u3059\uff1a <strong>zfs_arc_max<\/strong> \u4e0a\u9650\u3068\u3057\u3066\u3001\u304a\u3088\u3073 <strong>zfs_arc_min<\/strong> \u4e0b\u9650\u3068\u3057\u3066\u3002zfs_arc_max \u304c 0 \u307e\u305f\u306f\u672a\u8a2d\u5b9a\u306e\u5834\u5408\u3001ZFS \u306f\u81ea\u52d5\u7684\u306b\u9069\u5207\u306a\u7bc4\u56f2\u3092\u9078\u629e\u3057\u307e\u3059\u3002\u591a\u304f\u306e\u5834\u5408\u3001\u305d\u306e\u7bc4\u56f2\u306f <strong>\u30e1\u30e2\u30ea\u30fc<\/strong>. \u8ca0\u8377\u306e\u30d4\u30fc\u30af\u6642\u306b\u306fARC\u306f\u7e2e\u5c0f\u3057\u307e\u3059\u304c\u3001zfs_arc_min\u3092\u4e0b\u56de\u3089\u306a\u3044\u3088\u3046\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u304a\u308a\u3001\u3053\u308c\u306b\u3088\u308a\u91cd\u8981\u306a\u30d6\u30ed\u30c3\u30af\u304cRAM\u306b\u6b8b\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u5236\u9650\u3092\u53b3\u3057\u3059\u304e\u308b\u3068\u3001\u30d2\u30c3\u30c8\u7387\u304c\u4f4e\u4e0b\u3057\u3001\u8aad\u307f\u53d6\u308aI\/O\u304c\u3088\u308a\u983b\u7e41\u306b <strong>\u30d7\u30ec\u30fc\u30c8<\/strong> \u5f8c\u308d\u306e\u65b9\u3002<\/p>\n\n<p>\u3053\u3053\u3067\u3044\u3046\u300c\u5b9f\u7528\u6027\u300d\u3068\u306f\u3001RAM\u304c\u5341\u5206\u306b\u3042\u308b\u3068\u5927\u304d\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u78ba\u4fdd\u3067\u304d\u3001\u305d\u308c\u304c\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3084VM\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306b\u304a\u3044\u3066\u5927\u304d\u306a <strong>\u4e8b\u696d\u6240<\/strong>. \u4ed6\u306e\u30b5\u30fc\u30d3\u30b9\u7528\u306e\u30b9\u30c8\u30ec\u30fc\u30b8\u304c\u4e0d\u8db3\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001zfs_arc_max\u3092\u610f\u56f3\u7684\u306b\u5236\u9650\u3057\u3001zfs_arc_min\u306f\u67d4\u8edf\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u6bb5\u968e\u7684\u306b\u30c6\u30b9\u30c8\u3092\u884c\u3044\u3001\u305d\u306e\u5f71\u97ff\u3092\u89b3\u5bdf\u3057\u305f\u4e0a\u3067\u3001\u5b9f\u969b\u306e\u50be\u5411\u5024\u306b\u57fa\u3065\u3044\u3066\u8abf\u6574\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u4e00\u6642\u7684\u306a\u30d4\u30fc\u30af\u306b\u3088\u3063\u3066 <strong>\u69cb\u6210<\/strong> \u652f\u914d\u3057\u3066\u3044\u308b\u3002\u6bb5\u968e\u7684\u306a\u8abf\u6574\u3092\u884c\u3046\u3053\u3068\u3067\u3001\u554f\u984c\u306e\u306a\u3044\u4fe1\u983c\u3067\u304d\u308b\u52d5\u4f5c\u304c\u5f97\u3089\u308c\u308b\u3002 <strong>\u30b5\u30d7\u30e9\u30a4\u30ba<\/strong>.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/08\/zfs_arc_cache_meeting_3942.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>ARC\u6307\u6a19\u306e\u6b63\u3057\u3044\u8aad\u307f\u65b9<\/h2>\n\n<p>\u72b6\u6cc1\u3092\u628a\u63e1\u3059\u308b\u305f\u3081\u306b\u3001\u4e3b\u8981\u306a\u6307\u6a19\u3092\u5b9a\u671f\u7684\u306b\u78ba\u8a8d\u3057\u3001\u305d\u306e\u95a2\u9023\u6027\u3092\u308f\u304b\u308a\u3084\u3059\u3044\u5f62\u3067\u6574\u7406\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u30c6\u30fc\u30d6\u30eb<\/strong> \u3002arcstat \u3084 arc_summary \u3068\u3044\u3063\u305f\u30c4\u30fc\u30eb\u306f\u7d99\u7d9a\u7684\u306b\u30c7\u30fc\u30bf\u3092\u63d0\u4f9b\u3057\u3066\u304a\u308a\u3001\u79c1\u306f\u305d\u308c\u3092\u30d7\u30fc\u30eb I\/O \u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30e1\u30c8\u30ea\u30af\u30b9\u3068\u95a2\u9023\u4ed8\u3051\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u969b\u3001\u500b\u3005\u306e\u7570\u5e38\u5024\u3088\u308a\u3082\u5168\u4f53\u50cf\u306e\u65b9\u304c\u91cd\u8981\u3067\u3042\u308a\u3001 <strong>\u56f3<\/strong>. \u30d2\u30c3\u30c8\u3068\u30df\u30b9\u306e\u6bd4\u7387\u306f\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u4f5c\u696d\u8ca0\u8377\u3092\u9069\u5207\u306b\u30ab\u30d0\u30fc\u3067\u304d\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u793a\u3059\u91cd\u8981\u306a\u6307\u6a19\u3067\u3059\u3002\u30d2\u30c3\u30c8\u7387\u304c\u9ad8\u3044\u3053\u3068\u306f\u3001\u5b89\u5b9a\u3057\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u3001 <strong>RAM<\/strong> \u305d\u3053\u306b\u3044\u308b\u3002<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30ad\u30fc\u30d1\u30fc\u30bd\u30f3<\/th>\n      <th>\u8aac\u660e<\/th>\n      <th>\u6ce8\u610f\u3057\u3066\u3044\u308b\u3053\u3068<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>ARC\u30b5\u30a4\u30ba<\/td>\n      <td>\u73fe\u5728\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30a4\u30ba\u306f <strong>RAM<\/strong><\/td>\n      <td>\u8ca0\u8377\u304c\u304b\u304b\u308b\u3068\u4f38\u3073\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u76ee\u306b\u898b\u3048\u3066\u7e2e\u3080<\/td>\n    <\/tr>\n    <tr>\n      <td>ARC c \/ c_max<\/td>\n      <td>\u76ee\u6a19\u5024\u304a\u3088\u3073\u6700\u5927\u76ee\u6a19\u5024<\/td>\n      <td>\u9ad8\u8ca0\u8377\u6642\u306ec_max\u3078\u306e\u63a5\u8fd1\u3001\u9759\u6b62\u6642\u306e\u7a7a\u6c17<\/td>\n    <\/tr>\n    <tr>\n      <td>\u6210\u529f\uff0f\u5931\u6557<\/td>\n      <td>\u4ee5\u4e0b\u306e\u671f\u9593\u306b\u304a\u3051\u308b\u6210\u529f\u30fb\u5931\u6557\u306e\u8a18\u9332 <strong>\u30b9\u30bf\u30fc\u30c8<\/strong><\/td>\n      <td>\u30df\u30b9\u304c\u5e38\u306b\u9ad8\u3044\uff1f \u51e6\u7406\u91cf\u307e\u305f\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30ea\u30b7\u30fc\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30d2\u30c3\u30c8\u7387<\/td>\n      <td>\u7dcf\u30a2\u30af\u30bb\u30b9\u6570\u306b\u5bfe\u3059\u308b\u30d2\u30c3\u30c8\u6570\u306f <strong>%<\/strong><\/td>\n      <td>\u53cd\u5fa9\u56de\u6570\u304c\u591a\u3044\u5834\u5408\uff1a80\uff5e90\u56de\uff08%\uff09\u304c\u73fe\u5b9f\u7684\u3001\u305d\u308c\u4ee5\u5916\u306f\u305d\u308c\u3088\u308a\u5c11\u306a\u3044<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<p>\u3053\u308c\u3089\u306e\u5024\u3092\u3082\u3068\u306b\u3001\u5177\u4f53\u7684\u306a\u5bfe\u7b56\u3092\u8b1b\u3058\u307e\u3059\u3002\u5341\u5206\u306a\u7a7a\u304dRAM\u304c\u3042\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u30d2\u30c3\u30c8\u7387\u304c\u4f4e\u3044\u307e\u307e\u306e\u5834\u5408\u306f\u3001zfs_arc_max\u3092\u614e\u91cd\u306b\u5897\u3084\u3057\u3001\u305d\u306e\u69d8\u5b50\u3092\u89b3\u5bdf\u3057\u307e\u3059\u3002 <strong>\u30c8\u30ec\u30f3\u30c9<\/strong>. \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u8ca0\u8377\u304c\u304b\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u8a2d\u5b9a\u3092\u7de9\u548c\u3057\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u3068I\/O\u8ca0\u8377\u3092\u518d\u5ea6\u6e2c\u5b9a\u3057\u307e\u3059\u3002\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u62e1\u5927\u3057\u3066\u3082\u8ca0\u8377\u304c\u8efd\u6e1b\u3055\u308c\u306a\u3044\u5834\u5408\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u30a2\u30af\u30bb\u30b9\u30d1\u30bf\u30fc\u30f3\u304c\u975e\u5e38\u306b\u30e9\u30f3\u30c0\u30e0\u3067\u3042\u308a\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u52b9\u679c\u304c\u4f4e\u4e0b\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u539f\u56e0\u3067\u3059\u3002 <strong>\u30b5\u30fc\u30d6<\/strong>. \u3002\u305d\u306e\u5834\u5408\u3001\u30c7\u30fc\u30bf\u306e\u30ed\u30fc\u30ab\u30eb\u5316\u306e\u5411\u4e0a\u3084\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u306e\u5206\u5272\u3068\u3044\u3063\u305f\u4ed6\u306e\u5bfe\u7b56\u306e\u65b9\u304c\u3001\u305f\u3044\u3066\u3044\u3088\u308a\u52b9\u679c\u7684\u3067\u3059\u3002\u5358\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u5bb9\u91cf\u3092\u5897\u3084\u3059\u3060\u3051\u3067\u306f\u3001\u3059\u3079\u3066\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3067\u304d\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002 <strong>\u554f\u984c<\/strong>.<\/p>\n\n<h2>ARC\u306e\u610f\u601d\u6c7a\u5b9a\u30d7\u30ed\u30bb\u30b9\uff1a\u30b4\u30fc\u30b9\u30c8\u30ea\u30b9\u30c8\u3068\u8abf\u6574<\/h2>\n\n<p>\u305d\u306e\u307b\u304b <strong>MRU<\/strong> \u305d\u3057\u3066 <strong>MFU<\/strong> ARC\u306f\u3001\u3044\u308f\u3086\u308b <strong>\u30b4\u30fc\u30b9\u30c8\u30ea\u30b9\u30c8<\/strong> (MRU\uff0fMFU-Ghost)\u3002\u3053\u308c\u3089\u306f\u3001\u6700\u8fd1\u8ffd\u3044\u51fa\u3055\u308c\u305f\u30d6\u30ed\u30c3\u30af\u306e\u30e1\u30bf\u30c7\u30fc\u30bf\u306e\u307f\u3092\u542b\u3093\u3067\u3044\u307e\u3059\u3002 \u3082\u3057\u3001\u3053\u308c\u3089\u306e\u30d6\u30ed\u30c3\u30af\u304c\u4e0a\u66f8\u304d\u76f4\u5f8c\u306b\u518d\u3073\u73fe\u308c\u305f\u5834\u5408\u3001ZFS\u306f\u305d\u308c\u306b\u5bfe\u5fdc\u3059\u308b\u9818\u57df\u306e\u30b5\u30a4\u30ba\u304c\u5c0f\u3055\u3059\u304e\u305f\u3068\u3044\u3046\u5146\u5019\u3068\u89e3\u91c8\u3057\u3001MRU\u3068MFU\u306e\u9593\u3067\u5bb9\u91cf\u3092\u518d\u914d\u5206\u3057\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b <strong>\u5b66\u3076<\/strong> \u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u3001\u8aa4\u3063\u305f\u4e88\u6e2c\u306b\u57fa\u3065\u3044\u3066\u81ea\u52d5\u7684\u306b\u52d5\u4f5c\u3057\u307e\u3059\u3002\u5b9f\u969b\u306b\u306f\u3001\u5909\u52d5\u3059\u308b\u30d1\u30bf\u30fc\u30f3\uff08\u4f8b\u3048\u3070\u3001\u5915\u65b9\u306e\u30d0\u30c3\u30c1\u51e6\u7406\u30a6\u30a3\u30f3\u30c9\u30a6\u306a\u3069\uff09\u306f\u3001\u6570\u30b5\u30a4\u30af\u30eb\u7d4c\u3064\u3068\u3001\u624b\u52d5\u3067\u4ecb\u5165\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u3088\u308a\u9069\u5207\u306b\u51e6\u7406\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002.<\/p>\n\n<p>\u3053\u306e\u6587\u8108\u306b\u304a\u3044\u3066\u3001\u79c1\u306f\u3068\u308a\u308f\u3051\u3001\u30df\u30b9\u304c\u6ce2\u306e\u3088\u3046\u306b\u767a\u751f\u3057\u3001\u305d\u306e\u5f8c\u3001\u547d\u4e2d\u7387\u304c\u76ee\u306b\u898b\u3048\u3066\u5909\u5316\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u89b3\u5bdf\u3057\u3066\u3044\u307e\u3059 <strong>\u5f15\u304d\u5bc4\u305b\u308b<\/strong>. \u305d\u306e\u3088\u3046\u306a\u72b6\u6cc1\u304c\u767a\u751f\u3059\u308b\u3068\u3001ARC\u30ed\u30b8\u30c3\u30af\u306f\u671f\u5f85\u901a\u308a\u306b\u6a5f\u80fd\u3057\u307e\u3059\u3002\u7e70\u308a\u8fd4\u3057\u5b9f\u884c\u3057\u3066\u3082\u30df\u30b9\u7387\u304c\u9ad8\u3044\u307e\u307e\u306e\u5834\u5408\u306f\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u30ef\u30fc\u30ad\u30f3\u30b0\u30bb\u30c3\u30c8\u304c\u5229\u7528\u53ef\u80fd\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u5bb9\u91cf\u3092\u4e0a\u56de\u3063\u3066\u3044\u308b\u304b\u3001\u30a2\u30af\u30bb\u30b9\u30d1\u30bf\u30fc\u30f3\u304c <strong>\u30e9\u30f3\u30c0\u30e0<\/strong>.<\/p>\n\n<h2>ARC\u304c\u5b9f\u969b\u306b\u90aa\u9b54\u306b\u306a\u308b\u306e\u306f\u3044\u3064\u306a\u306e\u304b<\/h2>\n\n<p>\u5171\u6709\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u74b0\u5883\u3067\u306f\u3001\u591a\u304f\u306e\u30b5\u30fc\u30d3\u30b9\u3068\u30e1\u30e2\u30ea\u3092\u5171\u6709\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u8ca0\u8377\u306e\u9ad8\u3044ARC\u304c\u3042\u308b\u3068\u3001\u52d5\u4f5c\u304c\u91cd\u304f\u306a\u308a\u3001\u30b9\u30ef\u30c3\u30d4\u30f3\u30b0\u304c\u767a\u751f\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002 <strong>\u4fc3\u9032\u3059\u308b<\/strong>. \u4eee\u60f3\u5316\u30db\u30b9\u30c8\u306e\u904b\u7528\u8005\u306f\u3001\u3053\u306e\u677f\u631f\u307f\u3092\u3088\u304f\u77e5\u3063\u3066\u3044\u308b\u3002\u3069\u306eVM\u3082RAM\u304c\u5897\u3048\u308c\u3070\u559c\u3076\u4e00\u65b9\u3067\u3001ZFS\u3082\u30ad\u30e3\u30c3\u30b7\u30e5\u30ea\u30bd\u30fc\u30b9\u3092\u4f7f\u3044\u305f\u304c\u308b\u304b\u3089\u3060\u3002\u6570\u30ae\u30ac\u30d0\u30a4\u30c8\u7a0b\u5ea6\u306e\u5c0f\u898f\u6a21\u306a\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u30b5\u30fc\u30d3\u30b9\u306e\u5fdc\u7b54\u6642\u9593\u304c\u5727\u8feb\u3055\u308c\u306a\u3044\u3088\u3046\u3001\u5236\u9650\u3092\u53b3\u3057\u304f\u8a2d\u5b9a\u3057\u3066\u3044\u308b <strong>\u88c5\u7f6e<\/strong>. \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u52d5\u4f5c\u304c\u91cd\u304f\u306a\u3063\u305f\u308a\u3001\u30b9\u30ef\u30c3\u30d7\u4f7f\u7528\u91cf\u304c\u5897\u52a0\u3057\u305f\u308a\u3001OOM\u30ad\u30e9\u30fc\u306b\u3088\u308b\u30a2\u30e9\u30fc\u30c8\u304c\u767a\u751f\u3057\u305f\u308a\u3059\u308b\u3068\u3001\u554f\u984c\u304c\u9855\u5728\u5316\u3057\u307e\u3059\u3002\u3053\u3046\u3057\u305f\u72b6\u6cc1\u3067\u306f\u3001\u660e\u78ba\u306a\u4e0a\u9650\u3092\u8a2d\u5b9a\u3057\u3001\u305d\u306e\u5f8c\u3001\u30b7\u30b9\u30c6\u30e0\u306b\u6570\u65e5\u9593\u304b\u3051\u3066 <strong>\u6bd4\u8f03<\/strong>.<\/p>\n\n<p>\u75c7\u72b6\u3001\u767a\u751f\u6642\u523b\u3001\u304a\u3088\u3073\u5f71\u97ff\u3092\u53d7\u3051\u305f\u7b87\u6240\u3092\u8a18\u9332\u3057\u3066\u3044\u307e\u3059 <strong>\u30b5\u30fc\u30d3\u30b9\u5185\u5bb9<\/strong>. \u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u304c\u5e38\u306b\u540c\u3058\u6642\u9593\u5e2f\u306b\u767a\u751f\u3059\u308b\u5834\u5408\u306f\u3001\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u30a6\u30a3\u30f3\u30c9\u30a6\u306e\u8a2d\u5b9a\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4f5c\u6210\u306e\u5236\u9650\u3001\u5927\u898f\u6a21\u306a\u30b9\u30ad\u30e3\u30f3\u4f5c\u696d\u306e\u6642\u671f\u5909\u66f4\u306a\u3069\u306e\u5bfe\u7b56\u3092\u691c\u8a0e\u3057\u307e\u3059\u3002\u7d44\u7e54\u7684\u306a\u5bfe\u7b56\u3067\u30d4\u30fc\u30af\u8ca0\u8377\u3092\u7de9\u548c\u3067\u304d\u306a\u3044\u5834\u5408\u306b\u9650\u308a\u3001\u6280\u8853\u7684\u306a\u5bfe\u5fdc\u3084\u5236\u9650\u5024\u306e\u8abf\u6574\u3092\u884c\u3044\u307e\u3059\u3002 <strong>\u30aa\u30f3<\/strong>. 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height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30b3\u30f3\u30c6\u30ca\u3001Cgroups\u3001\u304a\u3088\u3073NUMA\u306e\u7279\u8a18\u4e8b\u9805<\/h2>\n\n<p>\u30b3\u30f3\u30c6\u30ca\u74b0\u5883\u3067\u306f\u3001ARC\u306f <strong>\u30db\u30b9\u30c8\u5168\u4f53\u3067<\/strong> \u307e\u305f\u3001cgroup\u306b\u3088\u308b\u5236\u9650\u3082\u53d7\u3051\u307e\u305b\u3093\u3002Pod\u3084\u30b3\u30f3\u30c6\u30ca\u304c\u30e1\u30e2\u30ea\u5236\u9650\u306b\u9054\u3057\u3066\u3082\u3001\u30db\u30b9\u30c8\u304cARC\u3084\u4ed6\u306e\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u3063\u3066\u8ca0\u8377\u304c\u304b\u304b\u308b\u306e\u3092\u9632\u3050\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002 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\u8aad\u307f\u53d6\u308a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u9ad8\u6c34\u6e96\u3092\u7dad\u6301\u3057\u3001\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u304c\u89e3\u6d88\u3055\u308c\u305f\u5834\u5408\u306f\u3001\u305d\u306e\u5024\u3092\u627f\u8a8d\u3057\u3001 <strong>\u7406\u7531<\/strong>. \u3053\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306f\u3001\u4eca\u5f8c\u306e\u751f\u7523\u80fd\u529b\u306b\u95a2\u3059\u308b\u554f\u984c\u306b\u5bfe\u51e6\u3059\u308b\u4e0a\u3067\u5927\u3044\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002.<\/p>\n\n<h2>\u5727\u7e2eARC\u3068\u30d7\u30ea\u30d5\u30a7\u30c3\u30c1\u306e\u5fae\u8abf\u6574<\/h2>\n\n<p>\u591a\u304f\u306e\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u306f\u3001 <strong>\u5727\u7e2eARC<\/strong>: ZFS\u306f\u30c7\u30fc\u30bf\u3092\u5727\u7e2e\u3057\u305f\u72b6\u614b\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u4fdd\u6301\u3057\u3001\u30a2\u30af\u30bb\u30b9\u6642\u306b\u521d\u3081\u3066\u89e3\u51cd\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308aRAM\u3092\u7bc0\u7d04\u3057\u3001\u5b9f\u8cea\u7684\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6709\u52b9\u7bc4\u56f2\u3092\u5e83\u3052\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u969b\u3001\u79c1\u306f <strong>CPU<\/strong>-\u8ca0\u8377\u306b\u6ce8\u610f\u2015\u2015CPU\u3078\u306e\u4f9d\u5b58\u5ea6\u304c\u975e\u5e38\u306b\u9ad8\u3044\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u5fc5\u305a\u3057\u3082\u30e1\u30ea\u30c3\u30c8\u304c\u4e0a\u56de\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u660e\u78ba\u306b <strong>\u5727\u7e2e\u53ef\u80fd\u306a<\/strong> \u30c7\u30fc\u30bf\uff08\u30ed\u30b0\u3001\u30c6\u30ad\u30b9\u30c8\u3001\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306e\u4f4e\u3044VM\u30a4\u30e1\u30fc\u30b8\uff09\u306e\u5834\u5408\u3001\u305d\u306e\u52b9\u679c\u306f\u305f\u3044\u3066\u3044\u9855\u8457\u3067\u3059\u3002\u3055\u3089\u306b\u3001 <strong>ZFS\u30d7\u30ea\u30d5\u30a7\u30c3\u30c1<\/strong> (zfetch) \u306f\u9023\u7d9a\u3057\u305f\u30d1\u30bf\u30fc\u30f3\u3092\u691c\u51fa\u3057\u3001\u6b21\u306e\u30d6\u30ed\u30c3\u30af\u3092\u4e8b\u524d\u306b\u8aad\u307f\u8fbc\u307f\u307e\u3059\u3002\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u305f\u304f\u306a\u3044\u9577\u3044\u30b9\u30c8\u30ea\u30fc\u30e0\u8aad\u307f\u53d6\u308a\uff08\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3084\u30e1\u30c7\u30a3\u30a2\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u306a\u3069\uff09\u306e\u5834\u5408\u3001\u524d\u8ff0\u306e\u901a\u308a primarycache \u3092\u30e1\u30bf\u30c7\u30fc\u30bf\u306b\u91cd\u70b9\u7684\u306b\u5272\u308a\u5f53\u3066\u3001\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f zfetch \u306b <strong>\u30c7\u30d5\u30a9\u30eb\u30c8<\/strong>. \u30d7\u30ea\u30d5\u30a7\u30c3\u30c1\u3092\u5f37\u5236\u7684\u306b\u7121\u52b9\u306b\u3059\u308b\u3068\u3001\u6df7\u5408\u8ca0\u8377\u306e\u5834\u5408\u306b\u30df\u30b9\u304c\u5897\u52a0\u3059\u308b\u3053\u3068\u304c\u591a\u304f\u3001\u79c1\u306b\u3068\u3063\u3066\u306f\u4f8b\u5916\u3067\u3042\u308a\u3001\u901a\u5e38\u306e\u3053\u3068\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002.<\/p>\n\n<h2>\u6c38\u7d9a\u7684\u306a\u8a2d\u5b9a\u3092\u78ba\u5b9f\u306b\u9069\u7528\u3059\u308b<\/h2>\n\n<p>ARC\u306e\u95be\u5024\u306f\u3001\u79c1\u304c\u8a2d\u5b9a\u3057\u307e\u3059 <strong>\u3057\u3064\u3053\u3044<\/strong>, \u3001\u518d\u8d77\u52d5\u5f8c\u3082\u8a2d\u5b9a\u304c\u7dad\u6301\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u3001\u5909\u66f4\u306f\u63a7\u3048\u3081\u306b\u5c11\u3057\u305a\u3064\u884c\u3063\u3066\u304f\u3060\u3055\u3044\u3002\u5bb9\u91cf\u3092\u5897\u3084\u3059\u3053\u3068\u306f\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002\u30b7\u30b9\u30c6\u30e0\u306f\u8ffd\u52a0\u3055\u308c\u305f\u9818\u57df\u3092\u5f90\u3005\u306b\u5229\u7528\u3057\u3066\u3044\u304d\u307e\u3059\u3002. <strong>\u6c88\u4e0b<\/strong> \u4e00\u6642\u7684\u306b\u30a8\u30f4\u30a3\u30af\u30b7\u30e7\u30f3\u306e\u5897\u52a0\u3084I\/O\u306e\u5897\u52a0\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u79c1\u306f10\uff5e20-%\u5358\u4f4d\u3067\u5024\u3092\u4e0b\u3052\u300124\uff5e48\u6642\u9593\u7d4c\u904e\u3092\u89b3\u5bdf\u3057\u3066\u3044\u307e\u3059\u3002 \u5927\u898f\u6a21\u306a\u69cb\u6210\u5909\u66f4\u3084\u30ab\u30fc\u30cd\u30eb\uff0fZFS\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u5f8c\u306f\u3001\u5024\u304c\u4f9d\u7136\u3068\u3057\u3066\u59a5\u5f53\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u65b0\u3057\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f\u3001\u81ea\u52d5\u30d2\u30e5\u30fc\u30ea\u30b9\u30c6\u30a3\u30c3\u30af\u304c <strong>\u5909\u66f4<\/strong>.<\/p>\n\n<h2>L2ARC\u3092\u8ce2\u304f\u6d3b\u7528\u3059\u308b<\/h2>\n\n<p>SSD\/NVMe\u4e0a\u306eL2ARC\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u62e1\u5f35\u3057\u3001\u7279\u306b\u5927\u898f\u6a21\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u9069\u3057\u305f\u30c7\u30fc\u30bf\u91cf\u306b\u304a\u3044\u3066\u3001\u9855\u8457\u306a <strong>\u30b9\u30e9\u30b9\u30c8<\/strong>. \u6e2c\u5b9a\u5024\u304b\u3089\u3001RAM-ARC\u304c\u5e38\u306b\u9650\u754c\u72b6\u614b\u3067\u52d5\u4f5c\u3057\u3066\u304a\u308a\u3001\u30d5\u30e9\u30c3\u30b7\u30e5\u5074\u306e\u4f59\u88d5\u304c\u307e\u3060\u3042\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u3066\u304b\u3089\u521d\u3081\u3066\u3053\u308c\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u91cd\u8981\uff1aL2ARC\u306fRAM\u306e\u4ee3\u308f\u308a\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u305f\u30d6\u30ed\u30c3\u30af\u306e\u30e1\u30bf\u30c7\u30fc\u30bf\u306f\u30e1\u30a4\u30f3\u306eARC\u306b\u4fdd\u5b58\u3055\u308c\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3067\u3059\u3002 <strong>\u6ede\u5728<\/strong>. \u3057\u305f\u304c\u3063\u3066\u3001L2ARC\u306e\u30b5\u30a4\u30ba\u304c\u5927\u304d\u3059\u304e\u308b\u3068RAM\u306e\u6d88\u8cbb\u91cf\u304c\u5897\u52a0\u3057\u3001\u8a2d\u5b9a\u304c\u9069\u5207\u3067\u306a\u3044\u5834\u5408\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4f4e\u4e0b\u3059\u308b\u3053\u3068\u3055\u3048\u3042\u308a\u307e\u3059\u3002L2ARC\u3078\u306e\u66f8\u304d\u8fbc\u307f\u306b\u306fI\/O\u5e2f\u57df\u5e45\u304c\u5fc5\u8981\u3068\u306a\u308a\u3001 <strong>CPU<\/strong>, \u3001\u305d\u308c\u3092\u898b\u9003\u3059\u308f\u3051\u306b\u306f\u3044\u304d\u307e\u305b\u3093\u3002.<\/p>\n\n<p>L2ARC\u306f\u3001\u51e6\u7406\u5bfe\u8c61\u306e\u30c7\u30fc\u30bf\u91cf\u304cRAM\u306e\u5bb9\u91cf\u3092\u4e0a\u56de\u308b\u3082\u306e\u306e\u3001VM\u30a4\u30e1\u30fc\u30b8\u3084\u591a\u6570\u306e\u5c0f\u3055\u306a\u30d5\u30a1\u30a4\u30eb\u306a\u3069\u3001\u5e38\u306b\u985e\u4f3c\u3057\u305f\u30d5\u30a1\u30a4\u30eb\u304c\u5bfe\u8c61\u3068\u306a\u308b\u5834\u5408\u306b\u52b9\u679c\u3092\u767a\u63ee\u3057\u307e\u3059\u3002 <strong>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/strong>. \u62e1\u5f35\u3092\u884c\u3046\u524d\u306b\u3001I\/O\u7d71\u8a08\u3092\u78ba\u8a8d\u3057\u3001\u30d5\u30e9\u30c3\u30b7\u30e5\u5074\u306b\u7a7a\u304d\u5bb9\u91cf\u304c\u3042\u308a\u3001\u3059\u3067\u306b\u9650\u754c\u72b6\u614b\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u6761\u4ef6\u304c\u6574\u3063\u3066\u3044\u308c\u3070\u3001L2ARC\u306f\u591a\u304f\u306e\u5834\u5408\u3001\u4e00\u8cab\u3057\u3066\u4f4e\u3044\u30ec\u30a4\u30c6\u30f3\u30b7\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002 \u6b63\u78ba\u306a\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3001\u5341\u5206\u306aRAM\u306e\u4e88\u5099\u5bb9\u91cf\u3001\u305d\u3057\u3066\u9069\u5207\u306b\u8a2d\u5b9a\u3055\u308c\u305fL2ARC\u306e\u7d44\u307f\u5408\u308f\u305b\u304c\u3042\u3063\u3066\u521d\u3081\u3066\u3001\u671f\u5f85\u901a\u308a\u306e <strong>\u52b9\u679c<\/strong>. \u5927\u5bb9\u91cf\u306eSSD\u3092\u7121\u95c7\u306b\u8ffd\u52a0\u3057\u3066\u3082\u3001\u771f\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u304c\u89e3\u6d88\u3055\u308c\u308b\u3053\u3068\u306f\u3081\u3063\u305f\u306b\u306a\u3044\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/08\/ZFS_ARC_Cache_Office_1234.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>L2ARC\u306e\u8a73\u7d30\uff1a\u30a6\u30a9\u30fc\u30e0\u30a2\u30c3\u30d7\u6bb5\u968e\u3068\u6301\u7d9a\u6027<\/h2>\n\n<p>L2ARC\u306b\u306f <strong>\u30a6\u30a9\u30fc\u30e0\u30a2\u30c3\u30d7\u6bb5\u968e<\/strong>: \u4f5c\u6210\u76f4\u5f8c\u3084\u518d\u8d77\u52d5\u76f4\u5f8c\u306f\u3001\u6700\u521d\u306f\u7a7a\u306e\u72b6\u614b\u3001\u3042\u308b\u3044\u306f\u307e\u3060\u5b8c\u5168\u306b\u5229\u7528\u3067\u304d\u306a\u3044\u72b6\u614b\u306b\u306a\u308a\u307e\u3059\u3002\u6700\u65b0\u306e\u5b9f\u88c5\u3067\u306f\u30e1\u30bf\u30c7\u30fc\u30bf\u3092\u6c38\u7d9a\u7684\u306b\u4fdd\u6301\u3067\u304d\u308b\u305f\u3081\u3001L2ARC\u306f\u3088\u308a\u65e9\u304f\u518d\u3073 <strong>\u4e8b\u696d\u6240<\/strong>. \u3068\u306f\u3044\u3048\u3001\u30c7\u30fc\u30bf\u306e\u66f8\u304d\u8fbc\u307f\u306b\u306f\u6642\u9593\u304c\u304b\u304b\u308a\u3001I\/O\u5e2f\u57df\u5e45\u3092\u6d88\u8cbb\u3057\u307e\u3059\u3002 \u30d5\u30a3\u30fc\u30c9\u3092\u4e0d\u5fc5\u8981\u306b\u5236\u9650\u3059\u308b\u3053\u3068\u306f\u3057\u307e\u305b\u3093\u304c\u3001\u30d7\u30e9\u30a4\u30de\u30ea\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u306e\u305f\u3081\u306b\u5341\u5206\u306a\u4f59\u88d5\u3092\u6b8b\u3057\u3066\u3044\u307e\u3059\u3002\u7279\u306b\u91cd\u8981\u306a\u306e\u306f\u3001L2ARC\u304c\u30ed\u30b0\u3084\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u3068\u540c\u3058SSD\u306b\u8ca0\u8377\u3092\u304b\u3051\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u5c02\u7528\u306e\u4f4e\u30ec\u30a4\u30c6\u30f3\u30b7\u30c7\u30d0\u30a4\u30b9\u3068\u3001L2ARC\u7528\u306b\u73fe\u5b9f\u7684\u306b\u7b97\u51fa\u3055\u308c\u305fRAM\u306e\u5272\u308a\u5f53\u3066\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002<strong>\u30d8\u30c3\u30c0\u30fc<\/strong> \u306f\u5fc5\u9808\u3067\u3059\u3002.<\/p>\n\n<h2>\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u306e\u8a2d\u5b9a\uff1aprimarycache \u304a\u3088\u3073 secondarycache<\/h2>\n\n<p>\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u8abf\u6574\u3057\u3001ARC\u3068L2ARC\u304c\u6b63\u3057\u3044\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8aad\u307f\u8fbc\u3081\u308b\u3088\u3046\u306b\u3057\u307e\u3059 <strong>\u30db\u30fc\u30eb\u30c9<\/strong>. primarycache \u306f\u3001\u30c7\u30fc\u30bf\u3084\u30e1\u30bf\u30c7\u30fc\u30bf\u304c\u30e1\u30a4\u30f3 ARC \u306b\u683c\u7d0d\u3055\u308c\u308b\u304b\u3069\u3046\u304b\u3092\u5236\u5fa1\u3057\u3001secondarycache \u306f L2ARC \u306e\u5185\u5bb9\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002\u5927\u898f\u6a21\u3067\u9023\u7d9a\u7684\u306a\u30b9\u30c8\u30ea\u30fc\u30e0\uff08\u30e1\u30c7\u30a3\u30a2\u30a2\u30fc\u30ab\u30a4\u30d6\u306a\u3069\uff09\u306e\u5834\u5408\u3001ARC \u306b\u30e1\u30bf\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3057\u3001\u5b9f\u969b\u306e\u30c7\u30fc\u30bf\u30b9\u30c8\u30ea\u30fc\u30e0\u306f\u4fdd\u6301\u3057\u306a\u3044\u3060\u3051\u3067\u5341\u5206\u306a\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002 <strong>\u30d0\u30c3\u30d5\u30a1<\/strong>. \u30e1\u30bf\u30c7\u30fc\u30bf\u304c\u4e2d\u5fc3\u3068\u306a\u308b\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u3067\u306f\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u3092\u4f4e\u6e1b\u3059\u308b\u305f\u3081\u306b\u30c7\u30fc\u30bf\u3068\u30e1\u30bf\u30c7\u30fc\u30bf\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u307e\u3059\u3002\u3053\u306e\u5206\u96e2\u306b\u3088\u308a\u3001\u7121\u99c4\u3092\u9632\u304e\u3001\u95a2\u9023\u6027\u306e\u9ad8\u3044 <strong>\u30a2\u30af\u30bb\u30b9<\/strong>.<\/p>\n\n<p>\u79c1\u306f\u3001\u3059\u3079\u3066\u306e\u30d7\u30fc\u30eb\u306b\u5bfe\u3057\u3066\u4e00\u5f8b\u306b\u540c\u3058\u30eb\u30fc\u30eb\u3092\u9069\u7528\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3054\u3068\u306b\u7684\u3092\u7d5e\u3063\u3066\u30c6\u30b9\u30c8\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002 <strong>\u30bb\u30c3\u30c8<\/strong>. primarycache\/secondarycache \u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u4e0d\u8981\u306a I\/O \u3092\u524a\u6e1b\u3057\u3001\u30d2\u30c3\u30c8\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u30b7\u30b9\u30c6\u30e0\u52d5\u4f5c\u304c\u5b89\u5b9a\u3057\u3001\u5fdc\u7b54\u6642\u9593\u3092\u3088\u308a\u4e88\u6e2c\u3057\u3084\u3059\u304f\u306a\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u3082\u3001\u300c\u6e2c\u5b9a\u3001\u8abf\u6574\u3001\u518d\u6e2c\u5b9a\u300d\u3068\u3044\u3046\u6d41\u308c\u304c\u91cd\u8981\u3067\u3059\u3002 <strong>\u5c0f\u7bc0<\/strong>. \u3002\u3053\u3046\u3057\u305f\u7d30\u304b\u3044\u8abf\u6574\u3053\u305d\u304c\u3001\u3057\u3070\u3057\u3070\u6c7a\u5b9a\u7684\u306a\u4ed5\u4e0a\u3052\u3092\u3082\u305f\u3089\u3059\u3082\u306e\u3060\u3002.<\/p>\n\n<h2>\u91cd\u8907\u6392\u9664\uff08DDT\uff09\u306e\u7279\u4f8b\u3068RAM\u8981\u4ef6<\/h2>\n\n<p>\u30a2\u30af\u30c6\u30a3\u30d9\u30fc\u30c8 <strong>\u91cd\u8907\u6392\u9664<\/strong>, \u3001\u52b9\u7387\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u91cd\u8907\u6392\u9664\u30c6\u30fc\u30d6\u30eb\uff08DDT\uff09\u3092RAM\u306b\u4fdd\u6301\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3001\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u304c\u8457\u3057\u304f\u5897\u52a0\u3057\u307e\u3059\u3002\u4e00\u610f\u306e\u30d6\u30ed\u30c3\u30af\u3054\u3068\u306b\u30e1\u30bf\u30c7\u30fc\u30bf\u304c\u767a\u751f\u3057\u3001\u4e00\u822c\u7684\u306a\u30d6\u30ed\u30c3\u30af\u30b5\u30a4\u30ba\u3067\u306f\u3001\u305d\u306e\u5408\u8a08\u304c\u3059\u3050\u306b\u6570\u30ae\u30ac\u30d0\u30a4\u30c8\u306b\u9054\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002 RAM\u304c\u4e0d\u8db3\u3059\u308b\u3068\u3001ZFS\u306fDDT\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u30c7\u30a3\u30b9\u30af\u306b\u79fb\u884c\u3059\u308b\u305f\u3081\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u304c\u5897\u52a0\u3057\u3001ARC\u306e\u7a7a\u304d\u5bb9\u91cf\u304c\u5727\u8feb\u3055\u308c\u307e\u3059\u3002\u79c1\u306e\u7d4c\u9a13\u5247\u3068\u3057\u3066\u306f\u3001\u9ad8\u3044\u5197\u9577\u6027\u304c\u78ba\u4fdd\u3055\u308c\u3066\u3044\u308b\u5834\u5408\uff08\u4f8b\uff1aVDI\u3001\u540c\u4e00\u306eVM\u30a4\u30e1\u30fc\u30b8\u306a\u3069\uff09\u306b\u306e\u307f\u91cd\u8907\u6392\u9664\u3092\u6709\u52b9\u306b\u3057\u3001\u5341\u5206\u306a <strong>RAM<\/strong> \u5229\u7528\u53ef\u80fd\u3067\u3059\u3002\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f <strong>\u5727\u7e2e<\/strong> \u591a\u304f\u306e\u5834\u5408\u3001\u306f\u308b\u304b\u306b\u52b9\u679c\u7684\u306a\u624b\u6bb5\u3068\u306a\u308b\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/08\/zfs_arc_cache_9823.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3068\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/h2>\n\n<p>\u5b89\u5b9a\u3057\u305f\u904b\u7528\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u3001ARC\u30b5\u30a4\u30ba\u3001\u30d2\u30c3\u30c8\u7387\u3001I\/O\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3001\u304a\u3088\u3073\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\u306e <strong>\u4fdd\u7ba1\u8377\u91cd<\/strong>. ARC\u304c\u5e38\u306b\u9650\u754c\u72b6\u614b\u306b\u3042\u3063\u3066\u3082\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u652f\u969c\u304c\u51fa\u306a\u3044\u5834\u5408\u306f\u3001\u305d\u306e\u307e\u307e\u306b\u3057\u3066\u304a\u304d\u307e\u3059\u3002\u30b9\u30ef\u30c3\u30d4\u30f3\u30b0\u304c\u767a\u751f\u3057\u305f\u308a\u3001OOM\u306b\u8fd1\u3065\u3044\u3066\u3044\u308b\u5146\u5019\u304c\u898b\u3089\u308c\u305f\u5834\u5408\u306f\u3001\u7bc4\u56f2\u3092\u5236\u9650\u3057\u3001\u4e3b\u306a\u539f\u56e0\u3092\u5206\u6790\u3057\u307e\u3059\u3002\u4f75\u305b\u3066\u4ee5\u4e0b\u3092\u78ba\u8a8d\u3059\u308b\u3068\u5f79\u7acb\u3061\u307e\u3059\u3002 <a href=\"https:\/\/webhosting.de\/ja\/vm-vfs-%e3%82%ad%e3%83%a3%e3%83%83%e3%82%b7%e3%83%a5%e3%83%97%e3%83%ac%e3%83%83%e3%82%b7%e3%83%a3%e3%83%bc-linux-%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%b7%e3%82%b9%e3%83%86%e3%83%a0-%e3%82%ad\/\">vm.vfs_cache_pressure<\/a>, \u3001dentry\/inode\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u6b8b\u308a\u306e\u30e1\u30e2\u30ea\u306e\u6bd4\u7387\u3092 <strong>\u30d0\u30e9\u30f3\u30b9<\/strong>. \u79c1\u306f\u4fa1\u5024\u89b3\u3092\u5b64\u7acb\u3057\u3066\u3067\u306f\u306a\u304f\u3001\u5e38\u306b\u6587\u8108\u306e\u4e2d\u3067\u6349\u3048\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<p>arcstat\/arc_summary\u3001zpool\u3001iostat\u3001\u305d\u3057\u3066 top\/htop\/free\/vmstat \u3068\u3044\u3063\u305f\u30c4\u30fc\u30eb\u304c\u3001\u5fc5\u8981\u306a\u60c5\u5831\u3092\u63d0\u4f9b\u3057\u3066\u304f\u308c\u307e\u3059\u3002 <strong>\u8a3c\u62e0<\/strong>. \u30d4\u30fc\u30af\u3068\u51e6\u7406\u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u7167\u5408\u3057\u3001\u554f\u984c\u304c\u518d\u73fe\u3055\u308c\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u304c\u7e70\u308a\u8fd4\u3057\u767a\u751f\u3059\u308b\u5834\u5408\u306f\u3001\u6642\u9593\u67a0\u3001\u30b9\u30ed\u30c3\u30c8\u30ea\u30f3\u30b0\u3001\u307e\u305f\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u5236\u9650\u3092\u8abf\u6574\u3057\u307e\u3059\u3002\u66f2\u7dda\u304c\u5e73\u5766\u5316\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u51e6\u7406\u901f\u5ea6\u304c\u7dad\u6301\u3055\u308c\u308b\u5834\u5408\u306f\u3001 <strong>\u30bb\u30c3\u30c6\u30a3\u30f3\u30b0<\/strong>. \u305d\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u305d\u306e\u5834\u9650\u308a\u306e\u51fa\u6765\u4e8b\u306b\u53cd\u5fdc\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u6570\u9031\u9593\u3001\u6570\u30f6\u6708\u304b\u3051\u3066\u7d4c\u9a13\u3092\u7a4d\u307f\u91cd\u306d\u3066\u3044\u304f\u306e\u3067\u3059\u3002.<\/p>\n\n<h2>ARC\u3001\u30c0\u30fc\u30c6\u30a3\u30c7\u30fc\u30bf\u3001ZIL\/SLOG \u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b<\/h2>\n\n<p>\u5168\u4f53\u50cf\u3068\u3057\u3066\u306f\u3001ARC\u306b\u52a0\u3048\u3001 <strong>\u4e0d\u6b63\u78ba\u306a\u30c7\u30fc\u30bf<\/strong> \uff08\u5909\u66f4\u6e08\u307f\u3067\u3001\u307e\u3060\u30c7\u30a3\u30b9\u30af\u306b\u66f8\u304d\u8fbc\u307e\u308c\u3066\u3044\u306a\u3044\u30d6\u30ed\u30c3\u30af\uff09\u304cRAM\u3092\u5360\u6709\u3057\u307e\u3059\u3002\u3053\u306e\u9818\u57df\u306f\u4e0a\u9650\u306b\u9054\u3059\u308b\u307e\u3067\u62e1\u5927\u3057\u3001\u305d\u306e\u5f8c\u975e\u540c\u671f\u7684\u306b\u89e3\u653e\u3055\u308c\u307e\u3059\u3002\u66f8\u304d\u8fbc\u307f\u8ca0\u8377\u304c\u9ad8\u3044\u5834\u5408\u3001\u30c0\u30fc\u30c6\u30a3\u30c7\u30fc\u30bf\u304c\u4e00\u6642\u7684\u306b\u81a8\u308c\u4e0a\u304c\u308a\u3001ZFS\u304c\u30b9\u30ed\u30c3\u30c8\u30ea\u30f3\u30b0\u6a5f\u69cb\u3067\u5bfe\u5fdc\u3059\u308b\u524d\u306b\u30b7\u30b9\u30c6\u30e0\u306e\u52d5\u4f5c\u3092\u9045\u304f\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3055\u3089\u306b\u3001 <strong>ZIL<\/strong> (ZFS Intent Log) \u540c\u671f\u66f8\u304d\u8fbc\u307f\uff1b\u9ad8\u901f\u306aSLOG\u306f\u5f79\u7acb\u3064\u304c\u3001ARC\u306eRAM\u6d88\u8cbb\u91cf\u3092\u524a\u6e1b\u3059\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u3002\u79c1\u306f\u3053\u308c\u3089\u306e\u70b9\u3092\u660e\u78ba\u306b\u533a\u5225\u3057\u3066\u3044\u308b\uff1a\u30d2\u30c3\u30c8\u7387\u304c\u826f\u597d\u3067\u3042\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u66f8\u304d\u8fbc\u307f\u30ec\u30a4\u30c6\u30f3\u30b7\u304c\u9855\u8457\u306b\u9ad8\u3044\u5834\u5408\u306f\u3001\u591a\u304f\u306e\u5834\u5408\u3001ARC\u306e\u30b5\u30a4\u30ba\u304c\u5927\u304d\u3059\u304e\u308b\u3068\u3044\u3046\u3088\u308a\u3082\u3001\u30c0\u30fc\u30c6\u30a3\u30c7\u30fc\u30bf\u3084\u30ed\u30b0\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u304c\u539f\u56e0\u3067\u3042\u308b\u3053\u3068\u304c\u591a\u3044\u3002 <strong>\u30a2\u30fc\u30af<\/strong> \u305d\u3053\u306b\u3044\u308b\u3002<\/p>\n\n<h2>\u6e2c\u5b9a\u624b\u6cd5\uff1a\u6642\u9593\u67a0\u3068\u30c8\u30ec\u30f3\u30c9\u5206\u6790<\/h2>\n\n<p>\u591a\u304f\u306eZFS\u30ab\u30a6\u30f3\u30bf\u30fc\u306f\u3001\u305d\u308c\u4ee5\u6765\u7d2f\u7a4d\u7684\u306b <strong>\u30dc\u30fc\u30c8<\/strong> \u5b9f\u884c\u3059\u308b\u969b\u306f\u3001\u65e5\u5358\u4f4d\u307e\u305f\u306f\u9031\u5358\u4f4d\u3067\u5206\u6790\u3092\u884c\u3044\u307e\u3059\u3002\u30ec\u30fc\u30c8\uff08\u30d2\u30c3\u30c8\/\u79d2\u3001\u30df\u30b9\/\u79d2\uff09\u3092\u7b97\u51fa\u3057\u3001I\/O\u5f85\u3061\u6642\u9593\u3084CPU\u8ca0\u8377\u3068\u6bd4\u8f03\u3057\u307e\u3059\u3002 \u5927\u898f\u6a21\u306a\u8a2d\u5b9a\u5909\u66f4\u5f8c\u306f\u3001\u6bd4\u8f03\u5024\u3092\u300c\u30ea\u30bb\u30c3\u30c8\u300d\u3059\u308b\u304b\u3001\u305d\u306e\u6642\u70b9\u3092\u660e\u8a18\u3057\u3066\u3001\u5f71\u97ff\u3092\u660e\u78ba\u306b\u7279\u5b9a\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u30d2\u30c3\u30c8\u7387\u306f\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u3054\u3068\u306e\u6642\u9593\u5e2f\uff08\u672c\u756a\u306e\u30d4\u30fc\u30af\u6642\u9593\u3001\u591c\u9593\u3001\u30d0\u30c3\u30c1\u51e6\u7406\uff09\u3054\u3068\u306b\u8a55\u4fa1\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u3046\u3057\u306a\u3044\u3068\u3001\u5358\u4e00\u306e\u7dcf\u5408\u6570\u5024\u304c\u5b9f\u969b\u306e\u72b6\u6cc1\u3092\u8986\u3044\u96a0\u3057\u3066\u3057\u307e\u3046\u304b\u3089\u3067\u3059\u3002 <strong>\u30dc\u30c8\u30eb\u30cd\u30c3\u30af<\/strong>.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/08\/zfs-arc-serverraum-4829.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u5b9f\u4f8b\uff1a64 GB RAM\u3092\u642d\u8f09\u3057\u305f\u30aa\u30fc\u30eb\u30e9\u30a6\u30f3\u30c9\u30b5\u30fc\u30d0\u30fc<\/h2>\n\n<p>Web\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3001\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u6df7\u5728\u3055\u305b\u305f\u30b5\u30fc\u30d0\u30fc\u306f\u3001\u5fae\u8abf\u6574\u3092\u884c\u308f\u306a\u3051\u308c\u3070\u3001\u3059\u3050\u306b30\uff5e40 GB\u3092\u6d88\u8cbb\u3057\u3066\u3057\u307e\u3046 <strong>\u30a2\u30fc\u30af<\/strong>. \u3002\u305f\u3060\u3057\u3001\u3053\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\u304b\u306a\u308a\u306e\u91cf\u306eRAM\u3092\u5fc5\u8981\u3068\u3059\u308b\u305f\u3081\u3001zfs_arc_max\u3092\u7d0424\uff5e28 GB\u3001zfs_arc_min\u30928\uff5e12 GB\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u6570\u65e5\u5f8c\u3001\u30b9\u30ef\u30c3\u30d7\u4f7f\u7528\u7387\u304c\u4f4e\u4e0b\u3057\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u3082\u5b89\u5b9a\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f\u3002\u4e00\u65b9\u3067\u3001\u983b\u7e41\u306b\u30a2\u30af\u30bb\u30b9\u3055\u308c\u308b\u30c7\u30fc\u30bf\u306f\u5f15\u304d\u7d9a\u304d\u30ad\u30e3\u30c3\u30b7\u30e5\u5185\u306b\u4fdd\u6301\u3055\u308c\u3066\u3044\u307e\u3059\u3002 <strong>\u3046\u305d<\/strong>. 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<strong>\u65e5\u5e38\u696d\u52d9<\/strong>.<\/p>\n\n<p>\u6b21\u306e\u30b9\u30c6\u30c3\u30d7\u3067\u306f\u3001\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u6700\u9069\u5316\u3057\u307e\u3059\u3002\u5927\u898f\u6a21\u306a\u9010\u6b21\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u5834\u5408\u3001ARC\u5185\u306e\u7d14\u7c8b\u306a\u30c7\u30fc\u30bf\u306e\u5272\u5408\u3092\u6e1b\u3089\u3057\u3001\u30e1\u30bf\u30c7\u30fc\u30bf\u3092\u512a\u5148\u3055\u305b\u307e\u3059\u3002 <strong>\u306b\u3068\u3063\u3066<\/strong>. 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\u751f\u7523\u74b0\u5883\u306b\u304a\u3044\u3066\u306f\u3001\u9577\u671f\u7684\u306a\u5b89\u5b9a\u6027\u304c\u77ed\u671f\u7684\u306a\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u3092\u4e0a\u56de\u308b\u3002\u305d\u306e\u305f\u3081\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u5229\u76ca\u3092\u3082\u305f\u3089\u3059\u3082\u306e\u3067\u3042\u308a\u3001\u8b66\u6212\u3084\u53b3\u3057\u3044\u63aa\u7f6e\u3092\u62db\u304f\u539f\u56e0\u306b\u306f\u306a\u3089\u306a\u3044\u3002 <strong>\u30b9\u30ed\u30c3\u30c8\u30eb<\/strong>.<\/p>\n\n<h2>\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068<\/h2>\n\n<p>\u79c1\u306f\u3001ARC\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u304c\u9ad8\u3044\u3053\u3068\u3092\u3001\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u72b6\u614b\u306e\u5146\u5019\u3060\u3068\u6349\u3048\u3066\u3044\u307e\u3059\u3002 <strong>\u4f7f\u7528\u65b9\u6cd5<\/strong> \u6b20\u70b9\u3068\u3057\u3066\u3067\u306f\u306a\u304f\u3002ZFS\u306f\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u89e3\u653e\u3057\u307e\u3059\u304c\u3001zfs_arc_max \u3068 zfs_arc_min \u306b\u3088\u3063\u3066\u305d\u306e\u7bc4\u56f2\u304c\u660e\u78ba\u306b\u5b9a\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002 <strong>\u5b9a\u7fa9<\/strong>. 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