Hello everyone, TL;DR: My 4 drives raid-5 array won't assemble on Debian. Look at the commands outputs: https://gist.github.com/AlexisBRENON/514500b90a477833c43584d62371925c --- It make some times (about 6 years) since I created my RAID5 array. Recently, I started to get some strange behaviors with my HDD: UEFI boot entry repeatidly erased, RAID component removed. In an attempt to fix these, I upgraded my BIOS firmware (why not, it was very outdated). However, this did not fix anything. In another attempt to understand what is happening, I run a SMART full test (from ArchLinux live USB key) on all my HDDs. Only one of the four RAID drives reports a read error (need to be replaced ?) as reported in this smartctl sum-up: https://gist.github.com/AlexisBRENON/514500b90a477833c43584d62371925c#file-01-smartctl-txt When booting on Debian, dmesg reported a ATA bus error. After some investigations, this comes from a faulty SATA cable. Changing cable fix it. Now, I'm here, with an up-to-date BIOS firmware and a 4 drives RAID-5 with 1 drive reporting some SMART read error (and one drive aside for the system (/boot, /usr, /var, etc.)). When booting debian, systemd timeouts failing to start some RAID devices and thus not mounting the MD device. Below are the links to outputs of most of the commands listed in https://raid.wiki.kernel.org/index.php/Asking_for_help. mdadm --examine: https://gist.github.com/AlexisBRENON/514500b90a477833c43584d62371925c#file-02-mdadm-examine This is very strange as some devices report 4 active drives, some 2, and some 3... Difference in events count do not seems very big, does it? mdadm --detail: https://gist.github.com/AlexisBRENON/514500b90a477833c43584d62371925c#file-03-mdadm-detail Does it really report raid0 as raid type? "Examine" reports an intended raid5 lsdrv: https://gist.github.com/AlexisBRENON/514500b90a477833c43584d62371925c#file-04-lsdrv mdstat: https://gist.github.com/AlexisBRENON/514500b90a477833c43584d62371925c#file-05-mdstat An attempt to assemble the array: https://gist.github.com/AlexisBRENON/514500b90a477833c43584d62371925c#file-06-stop-assemble Finally, the dmesg: https://gist.github.com/AlexisBRENON/514500b90a477833c43584d62371925c#file-07-dmesg Just to notice that I do not remenber to see ACPI Errors on lines 638-647 (https://gist.github.com/AlexisBRENON/514500b90a477833c43584d62371925c#file-07-dmesg-L638) before I updated the BIOS firmware. Is there a way to get back my data? Is it safe to use my array while waiting discount on HDDs and SATA cables (in one month)? Thanks for your reading and your help. Kind regards, Alexis BRENON.
