{"id":80184,"date":"2020-05-04T07:42:02","date_gmt":"2020-05-04T05:42:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh"},"modified":"2020-05-04T07:42:02","modified_gmt":"2020-05-04T05:42:02","slug":"vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh","title":{"rendered":"Inkompatibilitet mellan WD SMR-diskar och ZFS har uppt\u00e4ckts, vilket kan leda till dataf\u00f6rlust.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>F\u00f6retaget iXsystems, som utvecklar projektet FreeNAS,  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ixsystems.com\/blog\/library\/wd-red-smr-drive-compatibility-with-zfs\/\">har varnat<\/a><\/noindex> har uppm\u00e4rksammat allvarliga kompatibilitetsproblem med ZFS och vissa nya h\u00e5rddiskar fr\u00e5n WD Red, tillverkade av Western Digital med anv\u00e4ndning av SMR-teknologi (Shingled Magnetic Recording, takplattor inspelning). I v\u00e4rsta fall kan anv\u00e4ndning av ZFS p\u00e5 problematiska enheter leda till dataf\u00f6rlust. <\/p>\n<p>Problem uppst\u00e5r med WD Red-diskar med kapacitet fr\u00e5n 2 till 6 TB, tillverkade sedan 2018, som anv\u00e4nder <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.westerndigital.com\/wd-red-nas-drives\/\">DM-SMR<\/a><\/noindex> (Device-Managed Shingled Magnetic Recording), och <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.westerndigital.com\/wp-content\/uploads\/2020\/04\/2020_04_22_WD_SMR_SKUs_1Slide.pdf\">s\u00e4gs vara<\/a><\/noindex> m\u00e4rkt med etikett EFAX (f\u00f6r CMR-diskar anv\u00e4nds identifieraren EFRX). Western Digital <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.westerndigital.com\/wd-red-nas-drives\/\">har p\u00e5pekat<\/a><\/noindex> i sin blogg att WD Red SMR-enheter \u00e4r avsedda f\u00f6r anv\u00e4ndning i NAS f\u00f6r hemmet och sm\u00e5f\u00f6retag, d\u00e4r h\u00f6gst 8 enheter installeras och belastningen ligger p\u00e5 180 TB per \u00e5r, typisk f\u00f6r s\u00e4kerhetskopiering och filutbyte. Den tidigare generationen WD Red-enheter och modeller av WD Red med kapacitet fr\u00e5n 8 TB, samt diskar fr\u00e5n WD Red Pro, WD Gold och WD Ultrastar forts\u00e4tter att tillverkas med CMR-teknologi (Conventional Magnetic Recording), och deras anv\u00e4ndning orsakar inga problem med ZFS.<\/p>\n<p>K\u00e4rnan i SMR-teknologin \u00e4r anv\u00e4ndningen av en skrivhuvud med en bredd som \u00e4r st\u00f6rre \u00e4n bred p\u00e5 sp\u00e5ret, vilket leder till en inspelning med delvis \u00f6verlappning av angr\u00e4nsande sp\u00e5r, dvs. varje omskrivning kr\u00e4ver att hela grupper av sp\u00e5r skrivs om. F\u00f6r att optimera arbetet med s\u00e5dana enheter anv\u00e4nds <noindex><a rel=\"nofollow\" href=\"https:\/\/www.zonedstorage.io\/\">zonindelning<\/a><\/noindex> \u2014 lagringsutrymme delas in i zoner som best\u00e5r av grupper av block eller sektioner, d\u00e4r data endast f\u00e5r l\u00e4ggas till sekventiellt med uppdatering av hela blockgruppen. I allm\u00e4nhet har SMR-diskar st\u00f6rre effektivitet n\u00e4r det g\u00e4ller energif\u00f6rbrukning, \u00e4r mer prisv\u00e4rda och visar p\u00e5 f\u00f6rb\u00e4ttrad prestanda vid sekventiell dataskrivning, men presterar s\u00e4mre vid slumpm\u00e4ssiga skrivoperationer, inklusive s\u00e5dana operationer som omstrukturering av lagringsarrayer. <\/p>\n<p>DM-SMR inneb\u00e4r att zonering och dataf\u00f6rdelning hanteras av diskens kontroller och f\u00f6r systemet upptr\u00e4der en s\u00e5dan disk som en klassisk h\u00e5rddisk, som inte kr\u00e4ver separata \u00e5tg\u00e4rder. I DM-SMR anv\u00e4nds indirekt logisk blockadress (LBA, Logical Block Addressing), vilket liknar den logiska adresseringen i SSD-enheter. Efter varje operation av slumpm\u00e4ssig skrivning kr\u00e4vs en bakgrunds\u00e5tg\u00e4rd f\u00f6r att samla skr\u00e4p, vilket leder till of\u00f6ruts\u00e4gbara fluktuationer i prestanda. Systemet kan f\u00f6rs\u00f6ka till\u00e4mpa optimeringar p\u00e5 s\u00e5dana diskar, i tron att data kommer att skrivas till den angivna sektorn, men de uppgifter som kontrolleraren faktiskt ger definierar endast den logiska strukturen, och vid dataf\u00f6rdelningen till\u00e4mpar kontrolleraren sina algoritmer, vilket tar h\u00e4nsyn till tidigare placerade data. D\u00e4rf\u00f6r rekommenderas det att man utf\u00f6r en \u00e5tg\u00e4rd f\u00f6r att nollst\u00e4lla DM-SMR-diskar till ursprungligt tillst\u00e5nd innan de anv\u00e4nds i en ZFS-pool.<\/p>\n<p>F\u00f6retaget Western Digital har involverats i att unders\u00f6ka de f\u00f6rh\u00e5llanden under vilka problemen uppst\u00e5r, och tillsammans med iXsystems f\u00f6rs\u00f6ker man finna en l\u00f6sning och f\u00f6rbereda en firmwareuppdatering. Innan slutsatser om \u00e5tg\u00e4rder f\u00f6r att l\u00f6sa problemen publiceras planeras det att testa enheterna med den nya firmwareversionen i h\u00f6gbelastade lagringssystem med FreeNAS 11.3 och TrueNAS CORE 12.0. Det p\u00e5st\u00e5s att p\u00e5 vissa typer av SMR-diskar inte uppst\u00e5r problem med ZFS p\u00e5 grund av olika tolkningar av SMR av olika tillverkare, men den genomf\u00f6rda testen av iXsystems \u00e4r endast fokuserad p\u00e5 att kontrollera WD Red-diskar baserade p\u00e5 DM-SMR-tekniken, och f\u00f6r SMR-diskar <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ixsystems.com\/community\/resources\/list-of-known-smr-drives.141\/\">fr\u00e5n andra tillverkare<\/a><\/noindex> kr\u00e4vs ytterligare forskning.<\/p>\n<p>F\u00f6r n\u00e4rvarande har problemen med ZFS bevisats och upprepats i tester f\u00f6r minst WD Red 4TB WD40EFAX-diskar med firmware 82.00A82 och <noindex><a rel=\"nofollow\" href=\"https:\/\/blocksandfiles.com\/2020\/04\/15\/shingled-drives-have-non-shingled-zones-for-caching-writes\/\">manifesterar sig<\/a><\/noindex> \u00f6verg\u00e5r till ett fel-tillst\u00e5nd under h\u00f6g skrivbelastning, till exempel vid omstrukturering av lagringen efter att en ny enhet har lagts till i arrayen (resilvering). Problemet tros ocks\u00e5 f\u00f6rekomma p\u00e5 andra modeller av WD Red med samma firmware. Vid problem b\u00f6rjar disken returnera felkod IDNF (Sector ID Not Found) och blir oanv\u00e4ndbar, vilket hanteras i ZFS som en diskkrasch och kan leda till f\u00f6rlust av data som lagras p\u00e5 disken. Vid krasch av flera diskar kan data i vdev eller poolen g\u00e5 f\u00f6rlorade. Det noteras att de n\u00e4mnda krascherna intr\u00e4ffar ganska s\u00e4llan \u2014 av cirka tusen s\u00e5lda system FreeNAS Mini som var utrustade med problematiska diskar, uppstod problemet i arbetsmilj\u00f6er endast en g\u00e5ng.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>K\u00e4lla: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52867\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f iXsystems, \u0440\u0430\u0437\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u044e\u0449\u0430\u044f \u043f\u0440\u043e\u0435\u043a\u0442 FreeNAS, \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0430 \u043e \u0441\u0435\u0440\u044c\u0451\u0437\u043d\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u0445 \u0441 \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u044c\u044e ZFS \u0441 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u043c\u0438 \u043d\u043e\u0432\u044b\u043c\u0438 \u0436\u0451\u0441\u0442\u043a\u0438\u043c\u0438 \u0434\u0438\u0441\u043a\u0430\u043c\u0438 WD Red, \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0435\u043c\u044b\u043c\u0438 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Western Digital \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 SMR (Shingled Magnetic Recording, \u0447\u0435\u0440\u0435\u043f\u0438\u0447\u043d\u0430\u044f \u043c\u0430\u0433\u043d\u0438\u0442\u043d\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c). \u041f\u0440\u0438 \u043d\u0430\u0438\u0445\u0443\u0434\u0448\u0435\u043c \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 ZFS \u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u043d\u044b\u0445 \u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u044f\u0445 \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u043e\u0442\u0435\u0440\u0435 \u0434\u0430\u043d\u043d\u044b\u0445. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u044e\u0442 \u0441 \u0434\u0438\u0441\u043a\u0430\u043c\u0438 WD Red \u0451\u043c\u043a\u043e\u0441\u0442\u044c\u044e \u043e\u0442 2 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-80184","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f iXsystems, \u0440\u0430\u0437\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u044e\u0449\u0430\u044f \u043f\u0440\u043e\u0435\u043a\u0442 FreeNAS, \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0430 \u043e \u0441\u0435\u0440\u044c\u0451\u0437\u043d\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u0445 \u0441.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/sv\/blog\/news\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.4\" \/>\n\t\t<meta property=\"og:locale\" content=\"sv_SE\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u0412\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043d\u0435\u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u044c SMR-\u0434\u0438\u0441\u043a\u043e\u0432 WD \u0441 ZFS, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u043e\u0442\u0435\u0440\u0435 \u0434\u0430\u043d\u043d\u044b\u0445 | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f iXsystems, \u0440\u0430\u0437\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u044e\u0449\u0430\u044f \u043f\u0440\u043e\u0435\u043a\u0442 FreeNAS, \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0430 \u043e \u0441\u0435\u0440\u044c\u0451\u0437\u043d\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u0445 \u0441.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/sv\/blog\/news\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2020-05-04T05:42:02+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2020-05-04T05:42:02+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Inkompatibilitet hos SMR-diskar fr\u00e5n WD med ZFS uppt\u00e4cktes, vilket kan leda till dataf\u00f6rlust | ProHoster","description":"F\u00f6retaget iXsystems, som utvecklar projektet FreeNAS, varnar f\u00f6r allvarliga problem med.","canonical_url":"https:\/\/prohoster.info\/sv\/blog\/news\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sv_SE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0412\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043d\u0435\u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u044c SMR-\u0434\u0438\u0441\u043a\u043e\u0432 WD \u0441 ZFS, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u043e\u0442\u0435\u0440\u0435 \u0434\u0430\u043d\u043d\u044b\u0445 | ProHoster","og:description":"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f iXsystems, \u0440\u0430\u0437\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u044e\u0449\u0430\u044f \u043f\u0440\u043e\u0435\u043a\u0442 FreeNAS, \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0430 \u043e \u0441\u0435\u0440\u044c\u0451\u0437\u043d\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u0445 \u0441.","og:url":"https:\/\/prohoster.info\/sv\/blog\/news\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2020-05-04T05:42:02+00:00","article:modified_time":"2020-05-04T05:42:02+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"80184","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-02-28 16:22:49","updated":"2022-10-09 18:25:18","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/sv\/wp-json\/wp\/v2\/posts\/80184","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sv\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sv\/wp-json\/wp\/v2\/comments?post=80184"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/sv\/wp-json\/wp\/v2\/posts\/80184\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/sv\/wp-json\/wp\/v2\/media?parent=80184"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/sv\/wp-json\/wp\/v2\/categories?post=80184"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/sv\/wp-json\/wp\/v2\/tags?post=80184"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}