{"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\/ro\/blog\/news\/vyyavlena-nesovmestimost-smr-diskov-wd-s-zfs-kotoraya-mozhet-privesti-k-potere-dannyh","title":{"rendered":"A fost identificat\u0103 o incompatibilitate a discurilor SMR WD cu ZFS, care poate duce la pierderi de date","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Compania iXsystems, care dezvolt\u0103 proiectul FreeNAS, a avertizat<\/a><\/noindex> despre problemele grave de compatibilitate ZFS cu unele dintre noile hard disk-uri WD Red, produse de compania Western Digital folosind tehnologia SMR (Shingled Magnetic Recording, \u00eenregistrare magnetic\u0103 \u00een straturi). \u00cen cel mai r\u0103u scenariu, utilizarea ZFS pe aceste unit\u0103\u021bi problematice poate duce la pierderi de date. <\/p>\n

Problemele apar cu hard disk-urile WD Red de 2 p\u00e2n\u0103 la 6 TB, produse din 2018, care folosesc tehnologia de \u00eenregistrare DM-SMR<\/a><\/noindex> (Device-Managed Shingled Magnetic Recording) \u0219i sunt marcate<\/a><\/noindex> cu eticheta EFAX (pentru hard disk-urile CMR se folose\u0219te identificatorul EFRX). Western Digital a subliniat<\/a><\/noindex> \u00een blogul s\u0103u c\u0103 unit\u0103\u021bile SMR WD Red sunt destinate utiliz\u0103rii \u00een NAS pentru acas\u0103 \u0219i micile \u00eentreprinderi, \u00een care sunt instalate maximum 8 unit\u0103\u021bi \u0219i se observ\u0103 o \u00eenc\u0103rcare de aproximativ 180 TB pe an, specific\u0103 pentru backup \u0219i partajarea fi\u0219ierelor. Genera\u021bia anterioar\u0103 de unit\u0103\u021bi WD Red \u0219i modelele WD Red de 8 TB, precum \u0219i discurile din liniile WD Red Pro, WD Gold \u0219i WD Ultrastar continu\u0103 s\u0103 fie produse pe baza tehnologiei CMR (Conventional Magnetic Recording) \u0219i utilizarea lor nu cauzeaz\u0103 probleme cu ZFS.<\/p>\n

Esenta tehnologiei SMR const\u0103 \u00een utilizarea \u00een disc a unei capete magnetice, a c\u0103rei l\u0103\u021bime este mai mare dec\u00e2t cea a pistei, ceea ce duce la \u00eenregistrarea cu suprapunere par\u021bial\u0103 a pistei adiacente, adic\u0103 orice re\u00eenregistrare necesit\u0103 re\u00eenregistrarea \u00eentregului grup de piste. Pentru a optimiza lucrul cu astfel de unit\u0103\u021bi se folose\u0219te zonarea<\/a><\/noindex> \u2014 spa\u021biul de stocare este \u00eemp\u0103r\u021bit \u00een zone, form\u00e2nd grupuri de blocuri sau sectoare, \u00een care este permis\u0103 doar ad\u0103ugarea secven\u021bial\u0103 de date cu actualizarea \u00eentregului grup de blocuri. \u00cen general, discurile SMR au o eficien\u021b\u0103 mai mare \u00een ceea ce prive\u0219te consumul de energie, sunt mai accesibile ca pre\u021b \u0219i demonstreaz\u0103 o \u00eembun\u0103t\u0103\u021bire a performan\u021bei \u00een scrierea secven\u021bial\u0103 a datelor, dar sunt \u00een urma \u00een execu\u021bia opera\u021biunilor de scriere aleatorie, inclusiv \u00een opera\u021biuni precum reconstruc\u021bia aranjamentelor de stocare. <\/p>\n

DM-SMR presupune c\u0103 opera\u021biunile de zonare \u0219i distribu\u021bie a datelor sunt gestionate de controllerul de disc, iar pentru sistem, acest disc apare ca un hard disk clasic, care nu necesit\u0103 manevre separate. \u00cen DM-SMR se aplic\u0103 adresarea logic\u0103 indirect\u0103 a blocurilor (LBA, Logical Block Addressing), similar cu adresarea logic\u0103 \u00een SSD-uri. Dup\u0103 fiecare opera\u021biune de scriere aleatorie, este necesar\u0103 executarea unei opera\u021biuni de fond pentru colectarea de\u0219eurilor, ceea ce duce la fluctua\u021bii imprevizibile ale performan\u021bei. Sistemul poate \u00eencerca s\u0103 aplice optimiz\u0103ri pentru aceste discuri, presupun\u00e2nd c\u0103 datele vor fi scrise \u00een sectorul specificat, dar informa\u021biile furnizate de controller determin\u0103 doar structura logic\u0103, iar \u00een realitate, \u00een timpul distribuirii datelor, controllerul va utiliza algoritmii s\u0103i care iau \u00een considerare datele deja plasate. Prin urmare, \u00eenainte de a utiliza discurile DM-SMR \u00een pool-ul ZFS, se recomand\u0103 s\u0103 se efectueze o opera\u021biune de resetare pentru a le readuce la starea ini\u021bial\u0103.<\/p>\n

Pentru analiza condi\u021biilor \u00een care apar problemele, a fost implicat\u0103 compania Western Digital, care \u00eempreun\u0103 cu iXsystems caut\u0103 o solu\u021bie \u0219i preg\u0103te\u0219te o actualizare a firmware-ului. P\u00e2n\u0103 la publicarea concluziilor privind remedierile problemelor, unit\u0103\u021bile cu noul firmware urmeaz\u0103 s\u0103 fie testate pe stoc\u0103ri cu un grad ridicat de solicitare, folosind FreeNAS 11.3 \u0219i TrueNAS CORE 12.0. De asemenea, se afirm\u0103 c\u0103, din cauza diferitelor interpret\u0103ri ale SMR de c\u0103tre diver\u0219i produc\u0103tori, pe anumite tipuri de discuri SMR nu apar probleme cu ZFS, \u00eens\u0103 testarea realizat\u0103 de iXsystems se concentreaz\u0103 exclusiv pe verificarea discurilor WD Red bazate pe tehnologia DM-SMR, iar pentru discurile SMR altor produc\u0103tori<\/a><\/noindex> este necesar\u0103 o cercetare suplimentar\u0103.<\/p>\n

\u00cen prezent, problemele cu ZFS au fost dovedite \u0219i replicate \u00een teste, cel pu\u021bin pentru discurile WD Red de 4TB WD40EFAX cu firmware 82.00A82 \u0219i apar<\/a><\/noindex> devenind nefunc\u021bional sub o \u00eenc\u0103rcare mare la scriere, de exemplu, \u00een timpul reconstruc\u021biei stoc\u0103rii dup\u0103 ad\u0103ugarea unui nou dispozitiv \u00een aranjament (resilvering). Se presupune c\u0103 problema apare \u0219i la alte modele WD Red cu acela\u0219i firmware. Atunci c\u00e2nd apare problema, discul \u00eencepe s\u0103 returneze codul de eroare IDNF (Sector ID Not Found) \u0219i devine inutilizabil, ceea ce este tratat \u00een ZFS ca o defec\u021biune a discului \u0219i poate duce la pierderea datelor stocate pe disc. La defec\u021biunea mai multor discuri, datele din vdev sau pool pot fi pierdute. Se observ\u0103 c\u0103 aceste defec\u021biuni apar destul de rar \u2014 din aproximativ o mie de sisteme FreeNAS Mini v\u00e2ndute, care erau echipate cu discuri problematice, problema a ap\u0103rut \u00een condi\u021bii de lucru doar o singur\u0103 dat\u0103.<\/p>\n

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

Sursa: opennet.ro<\/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\udd47Incompatibilitate descoperit\u0103 \u00eentre hard disk-urile SMR WD \u0219i ZFS, ceea ce poate duce la pierderea datelor | ProHoster","description":"Compania iXsystems, care dezvolt\u0103 proiectul FreeNAS, a avertizat cu privire la probleme grave 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