{"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\/cs\/blog\/news\/problema-s-poterej-dannyh-na-ssd-pri-ispolzovanii-yadra-linux-5-1-lvm-i-dm-crypt","title":{"rendered":"Probl\u00e9m se ztr\u00e1tou dat na SSD p\u0159i pou\u017e\u00edv\u00e1n\u00ed j\u00e1dra Linux 5.1, LVM a dm-crypt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V opravn\u00e9 verzi j\u00e1dra Linux 5.1.5<\/a><\/noindex> byla opraven\u00e1<\/a><\/noindex> probl\u00e9m v subsyst\u00e9mu DM (Device Mapper), kter\u00fd m\u016f\u017ee v\u00e9st<\/a><\/noindex> vede k po\u0161kozen\u00ed dat na SSD \u00falo\u017ei\u0161t\u00edch. Probl\u00e9m se za\u010dal projevovat po zm\u011bny<\/a><\/noindex>, p\u0159idan\u00e9m do j\u00e1dra v lednu tohoto roku, se t\u00fdk\u00e1 pouze v\u011btve 5.1 a ve v\u011bt\u0161in\u011b p\u0159\u00edpad\u016f se projevuje na syst\u00e9mech se SSD \u00falo\u017ei\u0161ti Samsung, na kter\u00fdch je pou\u017eito \u0161ifrov\u00e1n\u00ed dat s vyu\u017eit\u00edm dm-crypt\/LUKS nad device-mapper\/LVM. <\/p>\n

P\u0159\u00ed\u010dinou probl\u00e9mu je<\/a><\/noindex> je p\u0159\u00edli\u0161 agresivn\u00ed ozna\u010dov\u00e1n\u00ed uvoln\u011bn\u00fdch blok\u016f pomoc\u00ed FSTRIM (p\u0159\u00edli\u0161 mnoho sektor\u016f bylo ozna\u010deno najednou, bez ohledu na limit max_io_len_target_boundary). Z distribuc\u00ed nab\u00edzej\u00edc\u00edch j\u00e1dro 5.1 byla chyba ji\u017e opravena v Fedora<\/a><\/noindex>, ale zat\u00edm nen\u00ed opraven\u00e1 v ArchLinux<\/a><\/noindex> (opravy jsou k dispozici, ale zat\u00edm se nach\u00e1zej\u00ed ve v\u011btvi «testing»). Jako obejit\u00ed blokov\u00e1n\u00ed probl\u00e9mu se naz\u00fdv\u00e1 deaktivace slu\u017eby fstrim.service\/timer, do\u010dasn\u00e9 p\u0159ejmenov\u00e1n\u00ed spustiteln\u00e9ho souboru fstrim, vylou\u010den\u00ed flagu «discard» z mo\u017enost\u00ed p\u0159ipojen\u00ed v fstab a vypnut\u00ed re\u017eimu «allow-discards» v LUKS prost\u0159ednictv\u00edm dmsetup.<\/p>\n

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

Zdroj: opennet.ru<\/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 \u0432 \u044f\u0434\u0440\u043e \u0432 \u044f\u043d\u0432\u0430\u0440\u0435 \u044d\u0442\u043e\u0433\u043e \u0433\u043e\u0434\u0430, \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u0432\u0435\u0442\u043a\u0443 5.1 \u0438 \u0432 \u043f\u043e\u0434\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u043c \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u0435 \u0441\u043b\u0443\u0447\u0430\u0435\u0432 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441 SSD-\u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u044f\u043c\u0438 Samsung, \u043d\u0430 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0434\u0430\u043d\u043d\u044b\u0445 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c 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