{"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\/et\/blog\/news\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh","title":{"rendered":"Avastatud on SMR-kettade WD ja ZFS vahelisi \u00fchilduvusprobleeme, mis v\u00f5ivad viia andmete kaotamiseni.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ettev\u00f5te iXsystems, mis arendab FreeNAS projekti, hoiatab<\/a><\/noindex> teatas t\u00f5sistest probleemidest ZFS-i \u00fchilduvusega m\u00f5ne uue WD Red k\u00f5vakettaga, mille tootmise taga on Western Digital ja mis kasutavad SMR-tehnoloogiat (Shingled Magnetic Recording, katusekujuline magnetiline salvestus). Halvimal juhul v\u00f5ib ZFS-i kasutamine probleemsete kettade peal viia andmete kaotamiseni. <\/p>\n

Probleemid ilmnevad WD Red k\u00f5vaketaste puhul, mille maht on 2 kuni 6 TB ja mis on toodetud alates 2018. aastast ning kasutavad salvestamiseks tehnoloogiat DM-SMR<\/a><\/noindex> (Device-Managed Shingled Magnetic Recording) ja millel on<\/a><\/noindex> m\u00e4rgis EFAX (CMR-kettade puhul kasutatakse identifikaatorit EFRX). Western Digital t\u00f5i esile<\/a><\/noindex> oma blogis, et SMR-kettad WD Red on m\u00f5eldud kodu- ja v\u00e4ikeste ettev\u00f5tete NAS-de kasutamiseks, kus on paigaldatud mitte rohkem kui 8 ketast ning koormus on umbes 180 TB aastas, mis on iseloomulik varundamise ja failide vahetamise jaoks. Eelmised WD Red k\u00f5vaketta mudelid ja WD Red 8 TB ja suuremad mudeleid, samuti WD Red Pro, WD Gold ja WD Ultrastar seeriad, j\u00e4tkuvad CMR-tehnoloogial (Conventional Magnetic Recording) ning nende kasutamine ei p\u00f5hjusta ZFS-iga probleeme.<\/p>\n

SMR-tehnoloogia olemus seisneb selles, et ketta magnetpea laius on suurem kui radu, mis toob kaasa naaberradade osalise kattumise salvestamise, st iga uuesti salvestamine n\u00f5uab kogu r\u00fchma radade \u00fcmberkirjutamist. Selliste ketaste t\u00f5hususe optimeerimiseks kasutatakse aladelistamist<\/a><\/noindex> \u2014 salvestusruum jaguneb tsoonideks, mis koosnevad plokkide v\u00f5i sektorite r\u00fchmadest, kuhu on lubatud ainult j\u00e4rjestikune andmete lisamine, uuendades kogu plokkide r\u00fchma korraga. \u00dcldiselt on SMR-diskid energiat\u00f5husamad, odavamad ja n\u00e4itavad paremat j\u00f5udlust j\u00e4rjestikulise andmete kirjutamise puhul, kuid j\u00e4\u00e4vad maha juhusliku kirjutamise toimingutes, sealhulgas andmete salvestamise massiivide \u00fcmberehitamisel. <\/p>\n

DM-SMR t\u00e4hendab, et andmete tsoonimise ja jaotamise toimingud hallatakse ketta kontrolleri poolt ning selline disk tundub s\u00fcsteemi jaoks nagu klassikaline k\u00f5vaketas, mis ei vaja eraldi manipuleerimist. DM-SMR-is kasutatakse kaudset loogilist plokkide adresseerimist (LBA, Logical Block Addressing), mis sarnaneb SSD-de loogilisele adresseerimisele. Iga juhusliku kirjutamise operatsiooni j\u00e4rel on vajalik taustal \u00fclevaatus, mis toob kaasa ettearvamatud j\u00f5udluse k\u00f5ikumised. S\u00fcsteem v\u00f5ib proovida rakendada sellistele kettale optimeerimist, arvates, et andmed kirjutatakse antud sektorisse, kuid tegelikult m\u00e4\u00e4ravad kontrolleri poolt antud andmed ainult loogilise struktuuri ja andmete jaotamisel rakendab kontroller oma algoritme, arvestades eelnevalt paigutatud andmeid. Seet\u00f5ttu on enne DM-SMR ketaste kasutamist ZFS p\u00f5himikus soovitatav teostada nende nullimist ja l\u00e4htestamist algseisundisse.<\/p>\n

Probleemide tingimuste anal\u00fc\u00fcsimiseks on kaasatud ettev\u00f5te Western Digital, mis koos iXsystemsiga p\u00fc\u00fcab leida lahendust ja ette valmistada tarkvarauuendust. Enne probleemide k\u00f5rvaldamise j\u00e4relduste avaldamist plaanitakse uusi tarkvaraversioone testida k\u00f5rgkoormatud salvestites, nagu FreeNAS 11.3 ja TrueNAS CORE 12.0. Samuti v\u00e4idetakse, et erinevate tootjate erinev arusaam SMR-ist ei p\u00f5hjusta m\u00f5nede SMR-diskide puhul ZFS-is probleeme, kuid iXsystems teostatud testimine keskendub ainult WD Red diskide katsetamisele DM-SMR tehnoloogia baasil, mitte teiste tootjate SMR-diskidele. muud tootjad<\/a><\/noindex> n\u00f5uavad t\u00e4iendavat uurimist.<\/p>\n

Praegu on ZFS-i probleemid t\u00f5estatud ja v\u00e4hemalt WD Red 4TB WD40EFAX ketaste 82.00A82 tarkvara testide tulemusi on korratud. avaldub<\/a><\/noindex> sissekj\u00f5udmisega t\u00f5rjeolekusse k\u00f5rge kirjutuskoormuse korral, n\u00e4iteks salvestusmahu \u00fcmberehitamise ajal uue salvestusseadmestiku lisamisel (resilvering). Eeldatakse, et probleem ilmneb ka teistel WD Red mudelitel, millel on sama sisefirmav\u00e4rskendus. Probleemi ilmnemisel hakkab ketas tagastama vea koodi IDNF (Sector ID Not Found) ja muutub kasutusk\u00f5lbmatuks, mis ZFS-is t\u00f5lgendatakse ketta t\u00f5rkena ja v\u00f5ib viia andmete kadumiseni, mis on kettal salvestatud. Kui mitu ketast t\u00f5rke alla l\u00e4heb, v\u00f5ivad andmed vdev-s v\u00f5i puus kaduda. M\u00e4rgitakse, et nimetatud t\u00f5rked esinevad \u00fcsna harva \u2014 umbes tuhandest m\u00fc\u00fcdud FreeNAS Mini s\u00fcsteemist, mis olid varustatud probleemsete ketastega, ilmus probleem t\u00f6\u00f6tingimustes v\u00e4lja vaid korra.<\/p>\n

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

Allikas: 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\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\udd47Tuletatakse SMR-kettaste WD ja ZFS kokkusobimatuse ilmnemine, mis v\u00f5ib viia andmete kadumiseni | ProHoster","description":"iXsystems, FreeNAS projekti arendaja, hoiatab t\u00f5siste probleemide 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