{"id":106149,"date":"2022-12-18T21:36:39","date_gmt":"2022-12-18T19:36:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadro-linux-6-2-vojdut-uluchsheniya-raid5-6-v-btrfs"},"modified":"2022-12-18T21:36:39","modified_gmt":"2022-12-18T19:36:39","slug":"v-yadro-linux-6-2-vojdut-uluchsheniya-raid5-6-v-btrfs","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/v-yadro-linux-6-2-vojdut-uluchsheniya-raid5-6-v-btrfs","title":{"rendered":"Nel kernel Linux 6.2 saranno introdotti miglioramenti RAID5\/6 in Btrfs","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u0414\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u044f\u0434\u0440\u043e Linux 6.2 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u044b \u0443\u043b\u0443\u0447\u0448\u0435\u043d\u0438\u044f Btrfs, \u043a\u0430\u0441\u0430\u044e\u0449\u0438\u0435\u0441\u044f \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b &#171;write hole&#187; \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 RAID 5\/6. \u0421\u0443\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0441\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u043a \u0442\u043e\u043c\u0443, \u0447\u0442\u043e \u0435\u0441\u043b\u0438 \u043a\u0440\u0430\u0445 \u0441\u043b\u0443\u0447\u0438\u043b\u0441\u044f \u0432\u043e \u0432\u0440\u0435\u043c\u044f \u0437\u0430\u043f\u0438\u0441\u0438, \u0438\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u043d\u0435\u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e \u043f\u043e\u043d\u044f\u0442\u044c \u043a\u0430\u043a\u043e\u0439 \u0431\u043b\u043e\u043a \u043d\u0430 \u043a\u0430\u043a\u043e\u043c \u0438\u0437 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 RAID \u0437\u0430\u043f\u0438\u0441\u0430\u043b\u0441\u044f \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e, \u0430 \u0432 \u043a\u0430\u043a\u043e\u043c \u0437\u0430\u043f\u0438\u0441\u044c \u043d\u0435 \u0431\u044b\u043b\u0430 \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0430. \u0412 \u0441\u043b\u0443\u0447\u0430\u0435 \u043f\u043e\u043f\u044b\u0442\u043a\u0438 \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f RAID \u0432 \u043f\u043e\u0434\u043e\u0431\u043d\u043e\u0439 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u0438 \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u043e\u0438\u0437\u043e\u0439\u0442\u0438 \u0440\u0430\u0437\u0440\u0443\u0448\u0435\u043d\u0438\u0435 \u0431\u043b\u043e\u043a\u043e\u0432, \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0445 \u043d\u0435\u0434\u043e\u0437\u0430\u043f\u0438\u0441\u0430\u043d\u043d\u044b\u043c \u0431\u043b\u043e\u043a\u0430\u043c, \u043f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0431\u043b\u043e\u043a\u043e\u0432 RAID \u0440\u0430\u0441\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u043e\u0440\u0432\u0430\u043d\u043e. \u042d\u0442\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u0435\u0442 \u0432 \u043b\u044e\u0431\u044b\u0445 \u043c\u0430\u0441\u0441\u0438\u0432\u0430\u0445 RAID1\/5\/6, \u0433\u0434\u0435 \u043d\u0435 \u043f\u0440\u0438\u043d\u044f\u0442\u043e \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0445 \u043c\u0435\u0440 \u0434\u043b\u044f \u0431\u043e\u0440\u044c\u0431\u044b \u0441 \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u043c \u044d\u0444\u0444\u0435\u043a\u0442\u043e\u043c.    <\/p>\n<p>Nell'implementazione RAID, come RAID1 in btrfs, questo problema viene risolto mediante l'uso di checksum in entrambe le copie; in caso di discrepanza, i dati vengono semplicemente ripristinati dalla seconda copia. Questo approccio funziona anche se un dispositivo inizia a restituire dati non corretti invece di guastarsi completamente.    <\/p>\n<p>Tuttavia, nel caso di RAID5\/6, il filesystem non memorizza checksum per i blocchi di parit\u00e0: in una situazione normale, la correttezza dei blocchi \u00e8 verificata dal fatto che sono tutti dotati di checksum, e il blocco di parit\u00e0 pu\u00f2 essere ricreato dai dati. Tuttavia, in caso di scrittura parziale, questo approccio potrebbe non funzionare in determinate circostanze. In questo caso, durante il ripristino dell'array, \u00e8 possibile che i blocchi soggetti a scrittura incompleta vengano ripristinati in modo errato.    <\/p>\n<p>Nel caso di btrfs, questo problema \u00e8 particolarmente rilevante se la scrittura effettuata \u00e8 di dimensioni inferiori allo stripe. In questo caso, il filesystem deve eseguire un'operazione di lettura-modifica-scrittura (read-modify-write, RMW). Se durante ci\u00f2 si incontrano blocchi con scritture incomplete, l'operazione RMW pu\u00f2 causare danni che non verranno rilevati, nonostante i checksum. Gli sviluppatori hanno apportato modifiche in modo che l'operazione RMW controlli i checksum dei blocchi prima di eseguire l'operazione stessa e, se necessario, esegua anche un controllo dei checksum dopo la scrittura. Sfortunatamente, nel caso di scrittura di uno stripe incompleto (RMW), ci\u00f2 comporta un onere aggiuntivo per il calcolo dei checksum, ma aumenta significativamente l'affidabilit\u00e0. Per RAID6, questa logica non \u00e8 ancora pronta; tuttavia, per un guasto in RAID6, \u00e8 necessario che la scrittura non riesca su almeno 2 dispositivi, il che \u00e8 meno probabile.    <\/p>\n<p>\u0414\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u043c\u043e\u0436\u043d\u043e \u043e\u0442\u043c\u0435\u0442\u0438\u0442\u044c \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0438 \u043f\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044e RAID5\/6 \u043e\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432, \u0441\u0443\u0442\u044c \u043a\u043e\u0442\u043e\u0440\u044b\u0445  \u0441\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u043a \u0442\u043e\u043c\u0443, \u0447\u0442\u043e \u0432 Btrfs \u043f\u0440\u043e\u0444\u0438\u043b\u044c \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u043c\u0435\u0442\u0430\u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043c\u043e\u0436\u0435\u0442 \u043e\u0442\u043b\u0438\u0447\u0430\u0442\u044c\u0441\u044f. \u041f\u0440\u0438 \u044d\u0442\u043e\u043c \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u0440\u043e\u0444\u0438\u043b\u044c RAID1 (\u0437\u0435\u0440\u043a\u0430\u043b\u043e) \u0438\u043b\u0438 \u0434\u0430\u0436\u0435 RAID1C3 (3 \u043a\u043e\u043f\u0438\u0438) \u0434\u043b\u044f \u043c\u0435\u0442\u0430\u0434\u0430\u043d\u043d\u044b\u0445, \u0430 \u0434\u043b\u044f \u0434\u0430\u043d\u043d\u044b\u0445 RAID5 \u0438\u043b\u0438 RAID6. \u041f\u0440\u0438 \u044d\u0442\u043e\u043c \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043d\u0430\u0434\u0451\u0436\u043d\u0430\u044f \u0437\u0430\u0449\u0438\u0442\u0430 \u043c\u0435\u0442\u0430\u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435 &#171;write hole&#187; \u0441 \u043e\u0434\u043d\u043e\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u044b \u0438 \u0431\u043e\u043b\u0435\u0435 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043c\u0435\u0441\u0442\u0430, \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u043d\u043e\u0435 \u0434\u043b\u044f RAID5\/6, \u0441 \u0434\u0440\u0443\u0433\u043e\u0439. \u042d\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0438\u0437\u0431\u0435\u0433\u0430\u0442\u044c \u0440\u0430\u0437\u0440\u0443\u0448\u0435\u043d\u0438\u0439 \u0432 \u043c\u0435\u0442\u0430\u0434\u0430\u043d\u043d\u044b\u0445, \u0430 \u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u044b.    <\/p>\n<p>\u0422\u0430\u043a\u0436\u0435 \u043c\u043e\u0436\u043d\u043e \u043e\u0442\u043c\u0435\u0442\u0438\u0442\u044c, \u0447\u0442\u043e \u0434\u043b\u044f SSD \u0432 Btrfs \u0432 \u044f\u0434\u0440\u0435 6.2 \u0431\u0443\u0434\u0435\u0442 \u0430\u043a\u0442\u0438\u0432\u0438\u0440\u043e\u0432\u0430\u043d\u043e \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 &#171;discard&#187; (\u043f\u043e\u043c\u0435\u0442\u043a\u0430 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0451\u043d\u043d\u044b\u0445 \u0431\u043b\u043e\u043a\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0443\u0436\u0435 \u043c\u043e\u0436\u043d\u043e \u043d\u0435 \u0445\u0440\u0430\u043d\u0438\u0442\u044c \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u0438). \u0414\u043e\u0441\u0442\u043e\u0438\u043d\u0441\u0442\u0432\u043e\u043c \u044d\u0442\u043e\u0433\u043e \u0440\u0435\u0436\u0438\u043c\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u044b\u0441\u043e\u043a\u0430\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0438\u0437-\u0437\u0430 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0439 \u0433\u0440\u0443\u043f\u043f\u0438\u0440\u043e\u0432\u043a\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 &#171;discard&#187; \u0432 \u043e\u0447\u0435\u0440\u0435\u0434\u0438 \u0438 \u0434\u0430\u043b\u0435\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u0447\u0435\u0440\u0435\u0434\u0438 \u0444\u043e\u043d\u043e\u0432\u044b\u043c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u043c, \u0438\u0437-\u0437\u0430 \u0447\u0435\u0433\u043e \u043d\u043e\u0440\u043c\u0430\u043b\u044c\u043d\u044b\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u0424\u0421 \u043d\u0435 \u0437\u0430\u043c\u0435\u0434\u043b\u044f\u044e\u0442\u0441\u044f, \u043a\u0430\u043a \u0432 \u0441\u043b\u0443\u0447\u0430\u0435 \u0441 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u043c &#171;discard&#187; \u043f\u043e \u043c\u0435\u0440\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0431\u043b\u043e\u043a\u043e\u0432, \u0430 SSD \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0442\u044c \u0431\u043e\u043b\u0435\u0435 \u0443\u0434\u0430\u0447\u043d\u044b\u0435 \u0440\u0435\u0448\u0435\u043d\u0438\u044f. \u0421 \u0434\u0440\u0443\u0433\u043e\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u044b, \u0431\u043e\u043b\u0435\u0435 \u043d\u0435 \u043f\u043e\u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0443\u0442\u0438\u043b\u0438\u0442\u044b \u0442\u0438\u043f\u0430 fstrim, \u043f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 \u0432\u0441\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b\u0435 \u0431\u043b\u043e\u043a\u0438 \u0431\u0443\u0434\u0443\u0442 \u043e\u0447\u0438\u0449\u0430\u0442\u044c\u0441\u044f \u0432 \u0424\u0421 \u0431\u0435\u0437 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e\u0441\u0442\u0438 \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0441\u043a\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438 \u0431\u0435\u0437 \u0437\u0430\u043c\u0435\u0434\u043b\u0435\u043d\u0438\u044f \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=58352\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u044f\u0434\u0440\u043e Linux 6.2 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u044b \u0443\u043b\u0443\u0447\u0448\u0435\u043d\u0438\u044f Btrfs, \u043a\u0430\u0441\u0430\u044e\u0449\u0438\u0435\u0441\u044f \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b &#171;write hole&#187; 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