{"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\/hr\/blog\/news\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh","title":{"rendered":"Otkrivena nespojivost SMR diskova WD sa ZFS-om, \u0161to mo\u017ee dovesti do gubitka podataka","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Tvrtka iXsystems, koja razvija projekt FreeNAS, obavijestila<\/a><\/noindex> o ozbiljnim problemima s kompatibilno\u0161\u0107u ZFS-a s nekim novim tvrdom diskovima WD Red koje proizvodi tvrtka Western Digital koriste\u0107i tehnologiju SMR (Shingled Magnetic Recording, preklopna magnetska snimanja). U najgorem scenariju, kori\u0161tenje ZFS-a na problemati\u010dnim skladi\u0161tima mo\u017ee dovesti do gubitka podataka. <\/p>\n

Problemi se javljaju s diskovima WD Red kapaciteta od 2 do 6 TB, proizvedenim od 2018. godine, koji koriste tehnologiju za snimanje DM-SMR<\/a><\/noindex> (Device-Managed Shingled Magnetic Recording) i oznaku<\/a><\/noindex> EFAX (za CMR diskove koristi se identifikator EFRX). Western Digital nagla\u0161ava<\/a><\/noindex> na svom blogu da su SMR skladi\u0161ta WD Red namijenjena primjeni u NAS-ovima za doma\u0107instva i mala poduze\u0107a, gdje se instalira najvi\u0161e 8 skladi\u0161ta i optere\u0107enje se procjenjuje na 180 TB godi\u0161nje, karakteristi\u010dno za sigurnosno kopiranje i razmjenu datoteka. Prethodna generacija WD Red skladi\u0161ta i modeli WD Red od 8 TB, kao i diskovi iz serija WD Red Pro, WD Gold i WD Ultrastar, i dalje se proizvode na bazi tehnologije CMR (Conventional Magnetic Recording) i njihovo kori\u0161tenje ne uzrokuje probleme s ZFS-om.<\/p>\n

Bit tehnologije SMR le\u017ei u kori\u0161tenju magneta glave diska \u010dija je \u0161irina ve\u0107a od \u0161irine staze, \u0161to dovodi do snimanja s djelomi\u010dnim preklapanjem susjedne staze, tj. svaka prepisivanja zahtijeva ponovnu snimanje cijele grupe staza. Za optimizaciju rada s takvim skladi\u0161tima koristi se zoniranje<\/a><\/noindex> \u2014 prostor za pohranu dijeli se na zone koje \u010dine grupe blokova ili sektora, u koje je dopu\u0161teno samo sekvencijalno dodavanje podataka uz a\u017euriranje cijele grupe blokova. Op\u0107enito, SMR diskovi imaju ve\u0107u u\u010dinkovitost u pogledu potro\u0161nje energije, dostupniji su po cijeni i pokazuju pobolj\u0161anje u performansama tijekom sekvencijalnog pisanja podataka, ali su manje u\u010dinkoviti tijekom nasumi\u010dnog pisanja, uklju\u010duju\u0107i procese poput rekonstrukcije skladi\u0161nih nizova. <\/p>\n

DM-SMR podrazumijeva da operacije zoniranja i raspodjele podataka upravlja kontroler diska i za sustav takav disk izgleda kao klasi\u010dni tvrdi disk, koji ne zahtijeva posebne manipulacije. U DM-SMR se primjenjuje indirektna logi\u010dka adresacija blokova (LBA, Logical Block Addressing), koja podsje\u0107a na logi\u010dku adresaciju u SSD-ovima. Nakon svake operacije slu\u010dajnog pisanja potrebno je izvr\u0161iti pozadinsku operaciju prikupljanja sme\u0107a, \u0161to dovodi do nepredvidivih fluktuacija u performansama. Sustav mo\u017ee poku\u0161ati primijeniti optimizacije na takvim diskovima, smatraju\u0107i da \u0107e podaci biti zapisani u navedeni sektor, ali zapravo informacije koje pru\u017ea kontroler odre\u0111uju samo logi\u010dku strukturu i u stvarnosti prilikom raspodjele podataka kontroler \u0107e primijeniti svoje algoritme, uzimaju\u0107i u obzir prethodno smje\u0161tene podatke. Stoga se prije kori\u0161tenja DM-SMR diskova u ZFS bazenu preporu\u010duje izvr\u0161iti operaciju njihova resetiranja na tvorni\u010dke postavke.<\/p>\n

Za analizu uvjeta u kojima nastaju problemi uklju\u010dena je kompanija Western Digital, koja zajedno s iXsystems poku\u0161ava prona\u0107i rje\u0161enje i pripremiti a\u017euriranje firmvera. Do objave zaklju\u010daka o rje\u0161avanju problema, planira se testirati ure\u0111aje s novim firmverom na visoko optere\u0107enim skladi\u0161tima s FreeNAS 11.3 i TrueNAS CORE 12.0. Pri tome se navodi da zbog razli\u010ditog tuma\u010denja SMR-a od strane razli\u010ditih proizvo\u0111a\u010da na nekim vrstama SMR diskova ne dolazi do problema s ZFS-om, no testiranje iXsystemsa fokusirano je isklju\u010divo na provjeru WD Red diskova temeljenih na DM-SMR tehnologiji, dok za SMR diskove drugih proizvo\u0111a\u010da<\/a><\/noindex> potrebna su dodatna istra\u017eivanja.<\/p>\n

Trenuta\u010dno su problemi s ZFS-om dokazani i ponovljeni u testovima barem za WD Red 4TB WD40EFAX diskove s firmverom 82.00A82 i javljuju se<\/a><\/noindex> do prebacivanja u stanje kvara pri visokom optere\u0107enju pisanja, na primjer, tijekom rekonstrukcije skladi\u0161ta nakon dodavanja novog ure\u0111aja u niz (resilvering). Pretpostavlja se da se problem javlja i na drugim modelima WD Red s istim firmware-om. Kada do\u0111e do problema, disk po\u010dinje vra\u0107ati kod gre\u0161ke IDNF (Sector ID Not Found) i postaje neupotrebljiv, \u0161to se u ZFS-u tretira kao kvar diska i mo\u017ee rezultirati gubitkom podataka pohranjenih na disku. U slu\u010daju kvara vi\u0161e diskova, podaci u vdev-u ili bazenu mogu se izgubiti. \u010cini se da se navedeni kvarovi doga\u0111aju dovoljno rijetko \u2014 od otprilike tisu\u0107u prodanih sistema FreeNAS Mini koje su dolazile s problemati\u010dnim diskovima, problem se pojavio u radnim uvjetima samo jednom.<\/p>\n

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

Izvor: 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\udd47Otkrivena nekompatibilnost SMR-diskova WD s ZFS-om, \u0161to mo\u017ee dovesti do gubitka podataka | ProHoster","description":"Tvrtka iXsystems, koja razvija projekt FreeNAS, upozorila je na ozbiljne probleme 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