{"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\/cs\/blog\/news\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh","title":{"rendered":"Byla odhalena nekompatibilita WD SMR disk\u016f se ZFS, kter\u00e1 m\u016f\u017ee v\u00e9st ke ztr\u00e1t\u011b dat.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Spole\u010dnost iXsystems, kter\u00e1 vyv\u00edj\u00ed projekt FreeNAS,  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ixsystems.com\/blog\/library\/wd-red-smr-drive-compatibility-with-zfs\/\">varovala<\/a><\/noindex> m\u00e1 v\u00e1\u017en\u00e9 probl\u00e9my s kompatibilitou ZFS s n\u011bkter\u00fdmi nov\u00fdmi pevn\u00fdmi disky WD Red, kter\u00e9 vyr\u00e1b\u00ed spole\u010dnost Western Digital pomoc\u00ed technologie SMR (Shingled Magnetic Recording, vrstevnat\u00e1 magnetick\u00e1 nahr\u00e1vka). V nejhor\u0161\u00edm p\u0159\u00edpad\u011b m\u016f\u017ee pou\u017eit\u00ed ZFS na probl\u00e9mov\u00fdch \u00falo\u017ei\u0161t\u00edch v\u00e9st ke ztr\u00e1t\u011b dat. <\/p>\n<p>Probl\u00e9my se vyskytuj\u00ed u disk\u016f WD Red o kapacit\u011b od 2 do 6 TB, kter\u00e9 byly vyr\u00e1b\u011bny od roku 2018 a pou\u017e\u00edvaj\u00ed p\u0159i z\u00e1pisu technologii <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.westerndigital.com\/wd-red-nas-drives\/\">DM-SMR<\/a><\/noindex> (Device-Managed Shingled Magnetic Recording) a <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.westerndigital.com\/wp-content\/uploads\/2020\/04\/2020_04_22_WD_SMR_SKUs_1Slide.pdf\">jsou ozna\u010dov\u00e1ny<\/a><\/noindex> \u0161t\u00edtkem EFAX (pro CMR disky se pou\u017e\u00edv\u00e1 identifik\u00e1tor EFRX). Spole\u010dnost Western Digital <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.westerndigital.com\/wd-red-nas-drives\/\">poznamenala<\/a><\/noindex> ve sv\u00e9m blogu, \u017ee SMR \u00falo\u017ei\u0161t\u011b WD Red jsou ur\u010dena pro pou\u017eit\u00ed v NAS pro dom\u00e1cnost a mal\u00e9 podniky, kde je nainstalov\u00e1no maxim\u00e1ln\u011b 8 \u00falo\u017ei\u0161\u0165 a zat\u00ed\u017een\u00ed dosahuje \u00farovn\u011b 180 TB ro\u010dn\u011b, co\u017e je charakteristick\u00e9 pro z\u00e1lohov\u00e1n\u00ed a sd\u00edlen\u00ed soubor\u016f. P\u0159edchoz\u00ed generace \u00falo\u017ei\u0161\u0165 WD Red a modely WD Red s kapacitou od 8 TB, jako\u017e i disky \u0159ad WD Red Pro, WD Gold a WD Ultrastar, jsou nad\u00e1le vyr\u00e1b\u011bny na z\u00e1klad\u011b technologie CMR (Conventional Magnetic Recording) a jejich pou\u017eit\u00ed nevytv\u00e1\u0159\u00ed probl\u00e9my s ZFS.<\/p>\n<p>Podstatou technologie SMR je pou\u017eit\u00ed magnetick\u00e9 hlavy disku, jej\u00ed\u017e \u0161\u00ed\u0159ka je v\u011bt\u0161\u00ed ne\u017e \u0161\u00ed\u0159ka stopy, co\u017e vede k z\u00e1pisu s \u010d\u00e1ste\u010dn\u00fdm p\u0159ekryvem sousedn\u00ed stopy, tj. jak\u00e9koli p\u0159eps\u00e1n\u00ed vy\u017eaduje p\u0159eps\u00e1n\u00ed cel\u00e9 skupiny stop. Pro optimalizaci pr\u00e1ce s takov\u00fdmi \u00falo\u017ei\u0161ti se pou\u017e\u00edv\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.zonedstorage.io\/\">z\u00f3nov\u00e1n\u00ed<\/a><\/noindex> \u2014 \u00falo\u017ei\u0161t\u011b se d\u011bl\u00ed na z\u00f3ny, kter\u00e9 tvo\u0159\u00ed skupiny blok\u016f nebo sektor\u016f, do nich\u017e je povoleno pouze sekven\u010dn\u00ed p\u0159id\u00e1v\u00e1n\u00ed dat s \u00faplnou aktualizac\u00ed cel\u00e9 skupiny blok\u016f. Obecn\u011b maj\u00ed SMR disky lep\u0161\u00ed energetickou efektivitu, jsou cenov\u011b dostupn\u011bj\u0161\u00ed a vykazuj\u00ed zlep\u0161en\u00ed v v\u00fdkonu p\u0159i sekven\u010dn\u00edm z\u00e1pisu dat, ale zaost\u00e1vaj\u00ed p\u0159i prov\u00e1d\u011bn\u00ed n\u00e1hodn\u00e9ho z\u00e1pisu, v\u010detn\u011b operac\u00ed, jako je p\u0159estavba \u00falo\u017ei\u0161t\u011b. <\/p>\n<p>DM-SMR znamen\u00e1, \u017ee operace rozd\u011blov\u00e1n\u00ed a p\u0159id\u011blov\u00e1n\u00ed dat jsou \u0159\u00edzeny \u0159adi\u010dem disku a pro syst\u00e9m se takov\u00fd disk jev\u00ed jako klasick\u00fd pevn\u00fd disk, kter\u00fd nevy\u017eaduje \u017e\u00e1dn\u00e9 dal\u0161\u00ed \u00fapravy. V DM-SMR se pou\u017e\u00edv\u00e1 nep\u0159\u00edm\u00e1 logick\u00e1 adresace blok\u016f (LBA, Logical Block Addressing), kter\u00e1 p\u0159ipom\u00edn\u00e1 logickou adresaci u SSD \u00falo\u017ei\u0161\u0165. Po ka\u017ed\u00e9 operaci n\u00e1hodn\u00e9ho z\u00e1pisu je nutn\u00e9 prov\u00e9st pozad\u00ed \u010dinnosti \u00fadr\u017eby, co\u017e zp\u016fsobuje nep\u0159edv\u00eddateln\u00e9 kol\u00eds\u00e1n\u00ed v\u00fdkonu. Syst\u00e9m se m\u016f\u017ee sna\u017eit aplikovat na takov\u00e9 disky optimalizace, domn\u00edvaj\u00edc se, \u017ee data budou zaps\u00e1na do ur\u010den\u00e9ho sektoru, av\u0161ak skute\u010dn\u011b vyd\u00e1van\u00e9 informace \u0159adi\u010dem ur\u010duj\u00ed pouze logickou strukturu a p\u0159i p\u0159id\u011blov\u00e1n\u00ed dat aplikoval \u0159adi\u010d sv\u00e9 algoritmy, zohled\u0148uj\u00edc\u00ed d\u0159\u00edve um\u00edst\u011bn\u00e1 data. Proto se p\u0159ed pou\u017eit\u00edm DM-SMR disk\u016f v ZFS poolu doporu\u010duje prov\u00e9st jejich resetov\u00e1n\u00ed do v\u00fdchoz\u00edho stavu.<\/p>\n<p>K anal\u00fdze podm\u00ednek, za kter\u00fdch vznikaj\u00ed probl\u00e9my, byla p\u0159izv\u00e1na spole\u010dnost Western Digital, kter\u00e1 spolu s iXsystems se sna\u017e\u00ed naj\u00edt \u0159e\u0161en\u00ed a p\u0159ipravit aktualizaci firmwaru. P\u0159ed zve\u0159ejn\u011bn\u00edm z\u00e1v\u011br\u016f o odstran\u011bn\u00ed probl\u00e9m\u016f se pl\u00e1nuje testov\u00e1n\u00ed \u00falo\u017ei\u0161\u0165 s nov\u00fdm firmwarem na vysoce zat\u00ed\u017een\u00fdch syst\u00e9mech s FreeNAS 11.3 a TrueNAS CORE 12.0. P\u0159i\u010dem\u017e se tvrd\u00ed, \u017ee kv\u016fli odli\u0161n\u00e9mu v\u00fdkladu SMR r\u016fzn\u00fdmi v\u00fdrobci na n\u011bkter\u00fdch typech SMR disk\u016f probl\u00e9my se ZFS nevznikaj\u00ed, ale proveden\u00e9 testov\u00e1n\u00ed iXsystems se soust\u0159ed\u00ed pouze na ov\u011b\u0159ov\u00e1n\u00ed disk\u016f WD Red na b\u00e1zi technologie DM-SMR, av\u0161ak pro SMR disky <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ixsystems.com\/community\/resources\/list-of-known-smr-drives.141\/\">jin\u00fdch v\u00fdrobc\u016f<\/a><\/noindex> je pot\u0159eba dal\u0161\u00ed v\u00fdzkum.<\/p>\n<p>V sou\u010dasn\u00e9 dob\u011b jsou probl\u00e9my se ZFS prok\u00e1z\u00e1ny a zopakov\u00e1ny v testech alespo\u0148 pro disky WD Red 4TB WD40EFAX s firmwarem 82.00A82 a <noindex><a rel=\"nofollow\" href=\"https:\/\/blocksandfiles.com\/2020\/04\/15\/shingled-drives-have-non-shingled-zones-for-caching-writes\/\">projevuj\u00ed se.<\/a><\/noindex> p\u0159e\u0161el do stavu selh\u00e1n\u00ed p\u0159i vysok\u00e9 z\u00e1t\u011b\u017ei z\u00e1pisu, nap\u0159\u00edklad p\u0159i prov\u00e1d\u011bn\u00ed p\u0159estavby \u00falo\u017ei\u0161t\u011b po p\u0159id\u00e1n\u00ed nov\u00e9ho disku do pole (resilvering). P\u0159edpokl\u00e1d\u00e1 se, \u017ee probl\u00e9m se objevuje i u dal\u0161\u00edch model\u016f WD Red se stejn\u00fdm firmv\u00e9rem. P\u0159i v\u00fdskytu probl\u00e9mu disk za\u010dne vracet k\u00f3d chyby IDNF (Sector ID Not Found) a st\u00e1v\u00e1 se nepou\u017eiteln\u00fdm, co\u017e je v ZFS zpracov\u00e1no jako selh\u00e1n\u00ed disku a m\u016f\u017ee v\u00e9st ke ztr\u00e1t\u011b dat ulo\u017een\u00fdch na disku. P\u0159i selh\u00e1n\u00ed n\u011bkolika disk\u016f mohou b\u00fdt data v vdev nebo poolu ztracena. Uv\u00e1d\u00ed se, \u017ee uveden\u00e9 selh\u00e1n\u00ed se vyskytuje pom\u011brn\u011b z\u0159\u00eddka \u2014 z p\u0159ibli\u017en\u011b tis\u00edce prodan\u00fdch syst\u00e9m\u016f FreeNAS Mini, kter\u00e9 byly vybaveny probl\u00e9mov\u00fdmi disky, se probl\u00e9m projevilo ve skute\u010dn\u00fdch podm\u00ednk\u00e1ch pouze jednou.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <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 5.0.3 - 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\" 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