{"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\/novosti-interneta\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh","title":{"rendered":"Avastatud SSD WD SMR-diskide mittevastavus ZFS-iga, mis v\u00f5ib p\u00f5hjustada andmekadu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ettev\u00f5te iXsystems, mis arendab projekti FreeNAS, hoiatas<\/a><\/noindex> teatab t\u00f5sistest ZFS-i \u00fchilduvusprobleemidest, mis on seotud m\u00f5nede uute WD Red k\u00f5vakettadega, mida toodab Western Digital SMR-tehnoloogiat (katuseplaatide magnetiline salvestus) kasutades. Halvimal juhul v\u00f5ib ZFS-i kasutamine probleemsetel ketastel viia andmekadudeni. <\/p>\n

Probleemid tekivad WD Red ketastega, mille maht on vahemikus 2 kuni 6 TB, mis on toodetud alates 2018. aastast ja mis kasutavad kirjutamisel tehnoloogiat DM-SMR<\/a><\/noindex> (Seadmega hallatav katuseplaatide magnetiline salvestus) ja margitakse<\/a><\/noindex> sildiga EFAX (CMR-kettaste puhul kasutatakse identifikaatorit EFRX). Western Digital t\u00e4histas<\/a><\/noindex> oma blogis on \u00f6eldud, et WD Red SMR-kettad on m\u00f5eldud kodu ja v\u00e4ikeste ettev\u00f5tete NAS-ide kasutamiseks, kuhu installitakse mitte rohkem kui 8 ketast ja kus koormus on 180 TB aastas, mis on iseloomulik varundamisele ja failide vahetamisele. Eelneva p\u00f5lvkonna WD Red kettad ja mudelid, mille mahutavus on alates 8 TB, samuti WD Red Pro, WD Gold ja WD Ultrastar kettad, j\u00e4tkavad tootmist CMR (Conventional Magnetic Recording) tehnoloogial ja nende kasutamine ei p\u00f5hjusta mingeid probleeme ZFS-iga.<\/p>\n

SMR-tehnoloogia p\u00f5hiolemus seisneb kettal asuva magnetpeade kasutamises, mille laius \u00fcletab soone laiuse, mis toob kaasa naabersoonte osalise kattumise, st mistahes \u00fcmberkirjutamine n\u00f5uab kogu soonegrupi \u00fcmberkirjutamist. Sarnaste ketaste t\u00f6\u00f6 optimeerimiseks kasutatakse tsoonimist<\/a><\/noindex> \u2014 salvestusruum jaguneb tsoonideks, mis moodustavad plokkide v\u00f5i sektorite gruppe, kuhu on lubatud ainult j\u00e4rjestikune andmete lisamine, uuendades kogu blokigruppi korraga. \u00dcldiselt omavad SMR-kettad energiatootmise efektiivsuses suuremat efektiivsust, on odavamad ning n\u00e4itavad paremaid tulemusi j\u00e4rjestikulise andmeedastuse korral, kuid j\u00e4\u00e4vad alla juhuslikule kirjutamisele, sealhulgas selliste toimingute nagu salvestusm\u00e4estike \u00fcmberehitamise korral. <\/p>\n

DM-SMR t\u00e4hendab, et andmete jaotamise ning jagamise toimingud hallatakse ketta kontrolleri poolt, mist\u00f5ttu selline ketas paistab s\u00fcsteemi jaoks olema traditsiooniline k\u00f5vaketas, mis ei vaja eraldi toimingute tegemist. DM-SMR-is rakendatakse kaudset loogilist plokkadressimist (LBA, Logical Block Addressing), mis sarnaneb SSD-de loogilisele adresseerimisele. Iga juhusliku kirjutamise toimingu j\u00e4rel on vajalik taustal olev pr\u00fcgikambrite kogumise operatsioon, mis toob kaasa ettearvamatud tootlikkuse k\u00f5ikumised. S\u00fcsteem v\u00f5ib proovida sellistele ketastele rakendada optimeerimisi, eeldades, et andmed kirjutatakse m\u00e4\u00e4ratud sektorisse, kuid tegelikult m\u00e4\u00e4rab kontrolleri antav teave vaid loogilise struktuuri ja andmete jaotamisel rakendab kontroller oma algoritme, arvesse v\u00f5ttes varem paigutatud andmeid. Seet\u00f5ttu soovitatakse DM-SMR ketaste kasutamisel ZFS-i paagis teha nende nullimine ja l\u00e4htestamine algseisundisse.<\/p>\n

Western Digital on kaasatud olukordade anal\u00fc\u00fcsimisse, mil probleeme tekkida v\u00f5ib, koost\u00f6\u00f6s iXsystemsiga, et leida lahendus ja valmistada ette uus tarkvarauuendus. Enne probleemide v\u00e4ltimise j\u00e4relduste avaldamist plaanitakse testida uusi firmware'iga seadmeid k\u00f5rgsurve all olevates salvestustesse FreeNAS 11.3 ja TrueNAS CORE 12.0. Kinnitatud on, et erinevate tootjate SMR-i t\u00f5lgendamisest tulenevalt ei esine teatud SMR-diskide puhul probleeme ZFS-iga, kuid iXsystemsi testimine keskendub ainult WD Red DM-SMR tehnoloogial p\u00f5hinevate ketaste kontrollimisele. teiste tootjate<\/a><\/noindex> vajab t\u00e4iendavat uurimist.<\/p>\n

Praeguseks on ZFS-i probleemid t\u00f5estatud ja v\u00e4hemalt WD Red 4TB WD40EFAX 82.00A82 firmware'iga ketaste testides on need uuesti ilmnenud, n\u00e4itavad end.<\/a><\/noindex> \u00fcleminek t\u00f5rkeolekusse k\u00f5rge kirjutuskoormuse korral, n\u00e4iteks mahtu uuendades p\u00e4rast uue seadme lisamist (resilvering). Eeldatakse, et probleem ilmneb ka teistel WD Red mudelitel, millel on sama p\u00fcsivara. Probleemide ilmnemisel hakkab kett tagasi p\u00f6\u00f6rduma IDNF (Sector ID Not Found) veakoodiga ja muutub kasutusk\u00f5lbmatuks, mida ZFS k\u00e4sitleb kettat\u00f5kena ja see v\u00f5ib p\u00f5hjustada kettal salvestatud andmete kadumist. Mitme ketta rikke korral v\u00f5ivad andmed vdevs v\u00f5i paagis kaduda. T\u00e4heldatakse, et nimetatud t\u00f5rked esinevad piisavalt harva \u2014 umbes tuhat m\u00fc\u00fcdud FreeNAS Mini s\u00fcsteemi, mis sisaldas probleemselt kettaid, ilmus probleem t\u00f6\u00f6tingimustes ainult \u00fcks kord.<\/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-novosti-interneta"],"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\udd47SMR-kettaste WD \u00fchilduvus ZFS-iga tuvastatud, mis v\u00f5ib viia andmete kaotamiseni | ProHoster","description":"Ettev\u00f5te iXsystems, kes arendab projekti FreeNAS, hoiatab t\u00f5siste probleemide 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