{"id":34535,"date":"2019-10-31T21:58:54","date_gmt":"2019-10-31T18:58:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/problema-s-poterej-dannyh-na-ssd-pri-ispolzovanii-yadra-linux-5-1-lvm-i-dm-crypt\/"},"modified":"2019-10-31T21:58:54","modified_gmt":"2019-10-31T18:58:54","slug":"problema-s-poterej-dannyh-na-ssd-pri-ispolzovanii-yadra-linux-5-1-lvm-i-dm-crypt","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/problema-s-poterej-dannyh-na-ssd-pri-ispolzovanii-yadra-linux-5-1-lvm-i-dm-crypt","title":{"rendered":"Problema pierderii de date pe SSD-uri folosind kernelul Linux 5.1, LVM \u0219i dm-crypt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00cen actualizarea corectiv\u0103 a nucleului Linux 5.1.5<\/a><\/noindex> a fost corectat\u0103<\/a><\/noindex> exist\u0103 o problem\u0103 \u00een subsistemul DM (Device Mapper), care poate duce<\/a><\/noindex> la deteriorarea datelor pe unit\u0103\u021bile SSD. Problema a \u00eenceput s\u0103 apar\u0103 dup\u0103 modific\u0103ri<\/a><\/noindex>, ad\u0103ugat \u00een nucleu \u00een ianuarie anul acesta, afecteaz\u0103 doar ramura 5.1 \u0219i, \u00een majoritatea cazurilor, se manifest\u0103 pe sistemele cu unit\u0103\u021bi SSD Samsung, pe care se aplic\u0103 criptarea datelor folosind dm-crypt\/LUKS pe l\u00e2ng\u0103 device-mapper\/LVM. <\/p>\n

Cauza problemei este<\/a><\/noindex> este marcarea prea agresiv\u0103 a blocurilor eliberate prin FSTRIM (prea multe sectoare fiind marcate simultan, f\u0103r\u0103 a \u021bine cont de limita max_io_len_target_boundary). \u00cen distribu\u021biile care ofer\u0103 nucleul 5.1, eroarea a fost deja corectat\u0103 \u00een Fedora<\/a><\/noindex>, dar r\u0103m\u00e2ne nerezolvat\u0103 \u00een ArchLinux<\/a><\/noindex> (corectarea este disponibil\u0103, dar momentan se afl\u0103 \u00een ramura «testing»). Ca o solu\u021bie alternativ\u0103 la blocarea problemei se recomand\u0103 dezactivarea serviciului fstrim.service\/timer, redenumirea temporar\u0103 a fi\u0219ierului executabil fstrim, excluderea op\u021biunii «discard» din fi\u0219ierul de montare fstab \u0219i dezactivarea modului «allow-discards» \u00een LUKS prin dmsetup.<\/p>\n

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

Sursa: opennet.ro<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0435\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 \u044f\u0434\u0440\u0430 Linux 5.1.5 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 DM (Device Mapper), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044e \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 SSD-\u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u044f\u0445. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0441\u0442\u0430\u043b\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0441\u043b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f, \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0433\u043e 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