{"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\/hu\/blog\/news\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh","title":{"rendered":"Felfedezt\u00fck a WD SMR lemezek ZFS-sel val\u00f3 inkompatibilit\u00e1s\u00e1t, ami adatveszt\u00e9shez vezethet.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Az iXsystems c\u00e9g, amely a FreeNAS projektet fejleszti, figyelmeztette<\/a><\/noindex> sz\u00e1mos \u00faj WD Red merevlemezzel kapcsolatos ZFS kompatibilit\u00e1si probl\u00e9m\u00e1kr\u00f3l sz\u00e1molt be, amelyeket a Western Digital gy\u00e1rt SMR (Shingled Magnetic Recording, \u00e1tfed\u0151 m\u00e1gneses felv\u00e9tel) technol\u00f3gia alkalmaz\u00e1s\u00e1val. A legrosszabb forgat\u00f3k\u00f6nyv eset\u00e9n a probl\u00e9m\u00e1s meghajt\u00f3kon a ZFS haszn\u00e1lata adatveszt\u00e9shez vezethet. <\/p>\n

A probl\u00e9m\u00e1k a 2018-t\u00f3l gy\u00e1rtott, 2-t\u0151l 6 TB kapacit\u00e1s\u00fa WD Red lemezekkel l\u00e9pnek fel, amelyek a DM-SMR<\/a><\/noindex> (Device-Managed Shingled Magnetic Recording) \u00edr\u00e1si technol\u00f3gi\u00e1t alkalmazz\u00e1k, \u00e9s EFAX c\u00edmk\u00e9vel vannak megjel\u00f6lve (a CMR lemezekhez az EFRX azonos\u00edt\u00f3t haszn\u00e1lj\u00e1k). A Western Digital<\/a><\/noindex> kihangs\u00falyozta a blogj\u00e1ban, hogy az SMR WD Red t\u00e1rol\u00f3k olyan NAS k\u00f6rnyezetekben az otthonokban \u00e9s kisv\u00e1llalkoz\u00e1sokban k\u00e9sz\u00fcltek, ahol legfeljebb 8 meghajt\u00f3t telep\u00edtenek, \u00e9s a terhel\u00e9s legfeljebb \u00e9vi 180 TB, jellemz\u0151en biztons\u00e1gi ment\u00e9sekhez \u00e9s f\u00e1jlmegoszt\u00e1shoz. A kor\u00e1bbi WD Red meghajt\u00f3k \u00e9s a 8 TB kapacit\u00e1s\u00fa WD Red modellek, valamint a WD Red Pro, WD Gold \u00e9s WD Ultrastar sorozat\u00fa lemezek tov\u00e1bbra is CMR (Conventional Magnetic Recording) technol\u00f3gi\u00e1n alapulnak, \u00e9s haszn\u00e1latuk nem okoz probl\u00e9m\u00e1t a ZFS-sel.<\/a><\/noindex> Az SMR technol\u00f3gia l\u00e9nyeg\u00e9t abban \u00e1ll, hogy a lemezen l\u00e9v\u0151 m\u00e1gneses fej sz\u00e9lesebb, mint a nyomvonal sz\u00e9less\u00e9ge, ami a szomsz\u00e9dos nyomvonalak r\u00e9szleges \u00e1tfed\u00e9s\u00e9t eredm\u00e9nyezi, m\u00edg b\u00e1rmilyen \u00fajra\u00edr\u00e1s az \u00f6sszes nyomvonal csoport \u00fajra\u00edr\u00e1s\u00e1t ig\u00e9nyli. Az ilyen meghajt\u00f3k optimaliz\u00e1l\u00e1s\u00e1hoz<\/p>\n

z\u00f3n\u00e1z\u00e1st alkalmaznak \u2013 a t\u00e1rol\u00e1si ter\u00fclet z\u00f3n\u00e1kra oszlik, amelyek blokk vagy szektor csoportokat alkotnak, ahov\u00e1 csak sorozatosan lehet adatokat hozz\u00e1adni, \u00e9s az eg\u00e9sz blokk csoportot friss\u00edteni kell. \u00c1ltal\u00e1nosan a SMR lemezek nagyobb hat\u00e9konys\u00e1ggal rendelkeznek energiafelhaszn\u00e1l\u00e1s szempontj\u00e1b\u00f3l, kedvez\u0151bb \u00e1ron el\u00e9rhet\u0151k \u00e9s teljes\u00edtm\u00e9nyn\u00f6veked\u00e9st mutatnak a soros \u00edr\u00e1skor, de lemaradnak a v\u00e9letlenszer\u0171 \u00edr\u00e1si m\u0171veletek v\u00e9grehajt\u00e1s\u00e1ban, ide\u00e9rtve a t\u00e1rol\u00f3 t\u00f6mb\u00f6k \u00fajb\u00f3li fel\u00e9p\u00edt\u00e9s\u00e9nek m\u0171veleteit is.<\/a><\/noindex> \u2014 A t\u00e1rol\u00e1si ter\u00fclet z\u00f3n\u00e1kra oszlik, amelyek blokkcsoportokb\u00f3l vagy szektorokb\u00f3l \u00e1llnak, ahol csak soros adatok hozz\u00e1ad\u00e1sa enged\u00e9lyezett, az eg\u00e9sz blokkcsoport friss\u00edt\u00e9s\u00e9vel. \u00c1ltal\u00e1noss\u00e1gban elmondhat\u00f3, hogy az SMR lemezek energiahat\u00e9konys\u00e1g szempontj\u00e1b\u00f3l nagyobb hat\u00e9konys\u00e1got mutatnak, \u00e1ron el\u00e9rhet\u0151bbek, \u00e9s el\u0151ny\u00f6s teljes\u00edtm\u00e9nyt mutatnak soros adatok \u00edr\u00e1sa eset\u00e9n, de lemaradnak a v\u00e9letlenszer\u0171 \u00edr\u00e1si m\u0171veletek v\u00e9grehajt\u00e1s\u00e1ban, bele\u00e9rtve az olyan m\u0171veleteket is, mint a t\u00e1rhelyt\u00f6mb\u00f6k \u00fajrarendez\u00e9se. <\/p>\n

A DM-SMR eset\u00e9ben az adatok z\u00f3n\u00e1z\u00e1s\u00e1t \u00e9s eloszt\u00e1s\u00e1t a lemezvez\u00e9rl\u0151 ir\u00e1ny\u00edtja, ami azt jelenti, hogy a rendszer sz\u00e1m\u00e1ra ez a lemez klasszikus merevlemezk\u00e9nt jelenik meg, amely nem ig\u00e9nyel k\u00fcl\u00f6n manipul\u00e1ci\u00f3kat. A DM-SMR a blokkok k\u00f6zvetett logikai c\u00edmz\u00e9s\u00e9t (LBA, Logical Block Addressing) alkalmazza, amely hasonl\u00edt az SSD-meghajt\u00f3k logikai c\u00edmz\u00e9s\u00e9re. Minden v\u00e9letlenszer\u0171 \u00edr\u00e1si m\u0171velet ut\u00e1n egy h\u00e1tt\u00e9rtev\u00e9kenys\u00e9g, a szem\u00e9t \u00f6sszegy\u0171jt\u00e9se sz\u00fcks\u00e9ges, ami el\u0151re nem l\u00e1that\u00f3 teljes\u00edtm\u00e9ny-ingadoz\u00e1sokat okoz. A rendszer megpr\u00f3b\u00e1lhat optimaliz\u00e1l\u00e1sokat alkalmazni az ilyen t\u00edpus\u00fa lemezekn\u00e9l, felt\u00e9telezve, hogy az adatok a megadott szektorba lesznek \u00edrva, de val\u00f3j\u00e1ban a vez\u00e9rl\u0151 \u00e1ltal szolg\u00e1ltatott inform\u00e1ci\u00f3k csak a logikai strukt\u00far\u00e1t hat\u00e1rozz\u00e1k meg, \u00e9s a t\u00e9nyleges adateloszt\u00e1s sor\u00e1n a vez\u00e9rl\u0151 saj\u00e1t algoritmusait fogja alkalmazni, figyelembe v\u00e9ve a kor\u00e1bban elhelyezett adatokat. Ez\u00e9rt a DM-SMR lemezek ZFS-t\u00f3ban val\u00f3 haszn\u00e1lata el\u0151tt javasolt null\u00e1z\u00e1si m\u0171velet v\u00e9grehajt\u00e1sa, amely vissza\u00e1ll\u00edtja \u0151ket eredeti \u00e1llapotukba.<\/p>\n

A probl\u00e9m\u00e1k felm\u00e9r\u00e9s\u00e9re a Western Digital c\u00e9get vont\u00e1k be, amely az iXsystems-szel k\u00f6z\u00f6sen pr\u00f3b\u00e1lja megtal\u00e1lni a megold\u00e1st \u00e9s el\u0151k\u00e9sz\u00edteni a firmware friss\u00edt\u00e9st. A probl\u00e9m\u00e1k orvosl\u00e1s\u00e1r\u00f3l sz\u00f3l\u00f3 meg\u00e1llap\u00edt\u00e1sok nyilv\u00e1noss\u00e1gra hozatala el\u0151tt a lemezeket \u00faj firmware-rel tesztelni k\u00edv\u00e1nj\u00e1k er\u0151sen terhelt FreeNAS 11.3 \u00e9s TrueNAS CORE 12.0 t\u00e1rol\u00f3kban. Ezen k\u00edv\u00fcl azt \u00e1ll\u00edtj\u00e1k, hogy a k\u00fcl\u00f6nb\u00f6z\u0151 gy\u00e1rt\u00f3k elt\u00e9r\u0151 \u00e9rtelmez\u00e9sei miatt egyes SMR-meghajt\u00f3k eset\u00e9ben nem mer\u00fclnek fel ZFS probl\u00e9m\u00e1k, de az iXsystems \u00e1ltal v\u00e9gzett tesztel\u00e9s kiz\u00e1r\u00f3lag a DM-SMR technol\u00f3gi\u00e1t haszn\u00e1l\u00f3 WD Red lemezek ellen\u0151rz\u00e9s\u00e9re \u00f6sszpontos\u00edt. m\u00e1s gy\u00e1rt\u00f3k<\/a><\/noindex> tov\u00e1bbi kutat\u00e1sra van sz\u00fcks\u00e9g.<\/p>\n

Jelenleg a ZFS-szel kapcsolatos probl\u00e9m\u00e1k bizony\u00edtottak \u00e9s a tesztekben legal\u00e1bb a WD Red 4TB WD40EFAX 82.00A82 firmware-j\u00e9vel megism\u00e9tl\u0151dtek, \u00e9s megnyilv\u00e1nulnak<\/a><\/noindex> hiba\u00e1llapotba ker\u00fcl magas \u00edr\u00e1si terhel\u00e9s eset\u00e9n, p\u00e9ld\u00e1ul, amikor a t\u00e1rhellyel val\u00f3 \u00fajrarendez\u00e9st hajtj\u00e1k v\u00e9gre egy \u00faj meghajt\u00f3 t\u00f6mbbe val\u00f3 hozz\u00e1ad\u00e1sakor (resilvering). Felt\u00e9telezik, hogy a probl\u00e9ma m\u00e1s WD Red modellekben is megjelenik, amelyek ugyanazzal a firmware-rel rendelkeznek. Ha a probl\u00e9ma felmer\u00fcl, a lemez elkezd IDNF (Sector ID Not Found) hibak\u00f3dot visszaadni, \u00e9s haszn\u00e1lhatatlann\u00e1 v\u00e1lik, amit a ZFS lemezhiba form\u00e1j\u00e1ban kezel, \u00e9s adatveszt\u00e9st okozhat a lemezen t\u00e1rolt adatokban. T\u00f6bb lemez meghib\u00e1sod\u00e1sa eset\u00e9n az adatok a vdev-ben vagy a pulton elveszhetnek. Megjegyzik, hogy a fent eml\u00edtett hib\u00e1k meglehet\u0151sen ritk\u00e1n jelentkeznek \u2014 k\u00f6r\u00fclbel\u00fcl ezer eladott FreeNAS Mini rendszerb\u0151l, amelyek probl\u00e9m\u00e1s lemezekkel voltak felszerelve, a probl\u00e9ma munkak\u00f6rnyezetben csak egyszer jelentkezett.<\/p>\n

<\/a><\/noindex><\/p>\n

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 […]<\/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\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Felfedezt\u00fck a WD SMR-lemezek \u00e9s a ZFS k\u00f6z\u00f6tti inkompatibilit\u00e1st, amely adatveszt\u00e9shez vezethet | ProHoster","description":"A FreeNAS projektet fejleszt\u0151 iXsystems komoly probl\u00e9m\u00e1kra 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