{"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\/fr\/blog\/news\/problema-s-poterej-dannyh-na-ssd-pri-ispolzovanii-yadra-linux-5-1-lvm-i-dm-crypt","title":{"rendered":"Probl\u00e8me de perte de donn\u00e9es sur SSD lors de l'utilisation du noyau Linux 5.1, LVM et dm-crypt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dans la mise \u00e0 jour corrective du noyau Linux 5.1.5<\/a><\/noindex> corrig\u00e9<\/a><\/noindex> le probl\u00e8me dans le sous-syst\u00e8me DM (Device Mapper), qui peut entra\u00eener<\/a><\/noindex> des dommages aux donn\u00e9es sur les disques SSD. Le probl\u00e8me s'est manifest\u00e9 apr\u00e8s modifications<\/a><\/noindex>, ajout\u00e9 au noyau en janvier de cette ann\u00e9e, concerne uniquement la branche 5.1 et se manifeste dans la grande majorit\u00e9 des cas sur les syst\u00e8mes \u00e9quip\u00e9s de disques SSD Samsung, o\u00f9 le chiffrement des donn\u00e9es utilise dm-crypt\/LUKS au-dessus de device-mapper\/LVM. <\/p>\n

La cause du probl\u00e8me est<\/a><\/noindex> est une marquage trop agressif des blocs lib\u00e9r\u00e9s via FSTRIM (trop de secteurs marqu\u00e9s \u00e0 la fois, sans tenir compte de la limite max_io_len_target_boundary). Dans les distributions proposant le noyau 5.1, l'erreur a d\u00e9j\u00e0 \u00e9t\u00e9 corrig\u00e9e dans Fedora<\/a><\/noindex>, mais reste non r\u00e9solue dans ArchLinux<\/a><\/noindex> (la correction est disponible, mais se trouve actuellement dans la branche «testing»). Comme solution de contournement, le blocage du probl\u00e8me est nomm\u00e9 la d\u00e9sactivation du service fstrim.service\/timer, le renommage temporaire du fichier ex\u00e9cutable fstrim, l'exclusion de l'option «discard» des options de montage dans fstab et la d\u00e9sactivation du mode «allow-discards» dans LUKS via dmsetup.<\/p>\n

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

Source : 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 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