On Tue, 03 Sep 2013 09:20:00 +0200 Roland 'ValiDOM' Jungnickel <vali2013@xxxxxxxxxx> wrote: > hi! > > I started reshaping a 3-device raid5 to a 4-device raid6. After some > hours, I got a fail event on a harddrive which was already used in the > raid5. > > There are two different raid-groups on these harddrives, a reshape of > the second one has not yet started. > > What would you suggest? > * stop the reshape, go back to raid5 and start rebuild to the new disk > (how?) > * just wait, hope and pray... ( there is no backup, I do not have > harddrives to backup to as this is just to much...) > > md0 : active raid6 sdc2[0] sde2[4](F) sdb2[3] sdd2[1] > 2858420224 blocks super 0.91 level 6, 64k chunk, algorithm 18 > [4/2] [UU__] > [=>...................] reshape = 7.8% (112662528/1429210112) > finish=4938.2min speed=4442K/sec > > md1 : active raid5 sdc1[0] sde1[2] sdb1[3](S) sdd1[1] > 1048575744 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU] > > (md1 not mounted, sde1 will fail once used/checked and the raid5 will > automatically start rebuild on sdb1) > I would probably add the new good drive to the array (after some basic testing to ensure that it really is good). Then stop the array and restart it. I think it will recovery and reshape at the same time though that might depend on what kernel you are using. Testing with loop-back devices should be fairly easy to confirm what will happen. mdadm-3.3 (just released) can reverse a reshape for you. mdadm --assemble /dev/md0 --update=revert-reshape /dev/sd[dbc]2 --backup=/whatever NeilBrown
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