{"id":4341,"date":"2020-10-30T20:49:36","date_gmt":"2020-10-30T19:49:36","guid":{"rendered":"https:\/\/webhosting.de\/?p=4341"},"modified":"2020-10-30T20:49:36","modified_gmt":"2020-10-30T19:49:36","slug":"create-ramdisk-under-linux","status":"publish","type":"post","link":"https:\/\/webhosting.de\/da\/erstellen-einer-ramdisk-unter-linux\/","title":{"rendered":"Oprettelse af en ramdiskette under Linux"},"content":{"rendered":"<p>En <a href=\"https:\/\/webhosting.de\/da\/ramdisk-zur-beschleunigung-erstellen\/\">ramdisk<\/a> er et lille virtuelt drev, der er en del af arbejdshukommelsen. Denne <a href=\"https:\/\/webhosting.de\/da\/wie-wichtig-ist-der-arbeitsspeicher-beim-webhosting\/\">Arbejdshukommelse<\/a> kaldes RAM. Lagerplads optages dynamisk og statisk. Dette filsystem er monteret og formateret p\u00e5 forh\u00e5nd. Hukommelsespladsen er gaffet og kan ikke tilg\u00e5s af systemet.<\/p>\n<h2>Den flygtige hukommelse- Ramdisketten<\/h2>\n<p>For Linux er ramdisketten vigtig for at muligg\u00f8re en hurtig l\u00e6se- og skriveproces. Den er derfor mindre udsat for slitage end en normal harddisk eller endog flash-hukommelse. En travl CPU eller en langsom netv\u00e6rksforbindelse kan naturligvis stoppe disken. Sletningsproblemer under filsystemer som ext3 eller ext4 kan endda omg\u00e5s. De usikre filer kopieres ikke til harddisken, men gemmes i filsystemet, dvs. p\u00e5 ramdisken. Bem\u00e6rk, at filerne ikke ender p\u00e5 harddisken. Nogle filer gemmer uopfordrede mellem. Der kan bruges forskellige m\u00e5der at oprette en RAM-disk p\u00e5.<\/p>\n<h3><a href=\"https:\/\/webhosting.de\/wp-content\/uploads\/2017\/01\/ufo.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-2023 alignright\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2017\/01\/ufo.png\" alt=\"hastighed ufo\" width=\"255\" height=\"255\" \/><\/a><\/h3>\n<h3>De forskellige muligheder<\/h3>\n<p>Den f\u00f8rste m\u00e5de ville v\u00e6re at oprette en ramdiskette med et tmps-filsystem. Dette er ikke et komplet RAM-system, men kan ogs\u00e5 gemmes p\u00e5 harddisken. <a href=\"https:\/\/webhosting.de\/da\/personenbezogene-daten-sozialen-netzwerken\/\">Data<\/a> spare. P\u00e5 denne m\u00e5de kan hukommelsen p\u00e5 ramdisken ikke blive for lille. Hvis drevet er tomt, kan det ikke forbruge hukommelse p\u00e5 disken. Disse partitioner kan monteres, n\u00e5r systemet startes.<br \/>\nDen anden m\u00e5de er ved at formatere harddisken. P\u00e5 denne m\u00e5de kan et omr\u00e5de v\u00e6lges som en RAM-disk. En indstilling -m0 skal sikre, at der ikke reserveres plads til root-brugeren. Det ville tage plads. Systemressourcerne skal faktisk tages v\u00e6k. S\u00e5 hukommelsen er mindre med partitioner. M\u00e5let er en ramdisk, som ikke kan l\u00e6ses eller skrives, men som har rettelser. Dette vil sandsynligvis blive indr\u00f8mmet. St\u00f8rrelsen af ramdisketten kan kaldes og \u00e6ndres med specielle kommandoer. Ved hver genstart forsvinder disken igen, s\u00e5 der skal oprettes et script, som gemmer kommandoerne. P\u00e5 denne m\u00e5de beh\u00f8ver kommandoerne ikke at blive indtastet igen.<br \/>\nDen tredje m\u00e5de er at arbejde med ramfs-filsystemet. Dette adskiller sig fra tmpfs-filsystemet ved, at dataene udskiftes. Det g\u00f8r det ogs\u00e5 nemt at oprette. Disken \u00e6ndres dynamisk i st\u00f8rrelse, og partitionen er altid monteret ved opstart. Dette kan forhindres med editoren og root-rettighederne.<\/p>\n<h3>St\u00f8rrelserne p\u00e5 RAM-diskerne<\/h3>\n<p>Hver af de oprettede ram-diske kan have forskellig st\u00f8rrelse. Dette er forskelligt for alle. Systemet skal v\u00e6re tilg\u00e6ngeligt som tilstr\u00e6kkelig RAM og swap-hukommelse, eller SWAP, skal ogs\u00e5 v\u00e6re tilg\u00e6ngeligt. Dette ville dog s\u00e6nke hastigheden p\u00e5 RAM-disken. 1 GB RAM b\u00f8r ofte v\u00e6re tilstr\u00e6kkeligt.<\/p>\n<p>En vejledning til Linux kan findes i artiklen\u00a0<a href=\"https:\/\/webhosting.de\/da\/ramdisk-to-accelerate-create\/\">Opret ramdisk til at accelerere Amavis p\u00e5 Linux<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Eine ramdisk ist ein winziges, virtuelles Laufwerk, das ein Teil des Arbeitsspeichers darstellt. Diesen Arbeitsspeicher nennt man RAM. Speicherplatz wird dynamisch und statisch belegt. Dieses Dateisystem wird eingeh\u00e4ngt und vorher formatiert. Der Speicherplatz wird abgezweigt und ist f\u00fcr das System nicht erreichbar. Der fl\u00fcchtige Speicher- Die ramdisk F\u00fcr Linux ist die ramdisk wichtig um einen 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