Hi Guillaume, On 10/24/2015 06:27 PM, Guillaume ALLEE wrote: > Hi all, > > Context: > On my RAID5 sdc was faulty. I bought a new HD, format it and add it to > my raid array. However during the rebuilding sda was detected as > faulty. Now I am not sure what to do... Unfortunately, you are suffering from classic timeout mismatch. I've put some links in the postscript for you to read. Most likely, your original sdc wasn't really bad. [trim /] > $ mdadm --examine /dev/sd[abcdefghijklmn]3 >> raid.status > http://pastebin.com/qaP8bvna Something's missing. I see only sd[abcd]3. Where's the report for /dev/sde* ? [trim /] > Full dmesg available at: > http://pastebin.com/bBfcYjkg Yes, you have WD20EARS and ST3000DM001 drive models. These are not safe to use in raid arrays due to lack of error recovery control. > Is there some way to re-add this disk (sda) in the array without mdadm > thinging it is a new one ? You need to stop the array and perform an '--assemble --force' with the last four devices (exclude /dev/sdc). The ones that have "Raid Device" 0, 1, 2, & 3. If that fails, show mdadm's responses in your next reply. If it works, your array will be available to mount, but degraded. You will not be able to add your new sdc to the array while there are unresolved UREs, so you will need to backup your important data from the degraded array. UREs can only be fixed by writing over them -- normally done automatically by MD with proper drives. You will have to overwrite those spots with zeroes or use dd_rescue to move the data to fresh drives (with zeroes in place of the unreadable spots). > I have seen from the wiki that I could try to recreate the array with > --assume-clean but I want to do that only in last resort. Do *NOT* recreate the array. (Unless you're starting over after backing up the files from the degraded array.) Phil [1] http://marc.info/?l=linux-raid&m=139050322510249&w=2 [2] http://marc.info/?l=linux-raid&m=135863964624202&w=2 [3] http://marc.info/?l=linux-raid&m=135811522817345&w=1 [4] http://marc.info/?l=linux-raid&m=133761065622164&w=2 [5] http://marc.info/?l=linux-raid&m=132477199207506 [6] http://marc.info/?l=linux-raid&m=133665797115876&w=2 [7] http://marc.info/?l=linux-raid&m=142487508806844&w=3 [8] http://marc.info/?l=linux-raid&m=144535576302583&w=2 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
