Am Mon, 2002-11-25 um 10.59 schrieb Neil Brown: > On Monday November 25, krause@mogli-soft.de wrote: > > > > hello neilbrown, > > > > thanks a lot for your fast response! > > i tried the command as you suggested but i am not sure if it really > > worked, it seems that /dev/sdc2 is not yet used (but of course i may be > > wrong! ;-) ) > ..... > > > > what about disk /dev/sdc2 ? i have tried to access /dev/sdc1 (a small > > ext2 partition) and the data there was correct, so it seems that the > > disk is accessable and did not got damaged by the shot power failure. > > > > how can i get the third disk back into the raid system? or do i have to > > backup all reconstructed data from the two disks and reinit the raid > > from the start? > > mdadm -A --force > will only 'force' into the array enough drives to make it work. For > your 3 drive raid5 array, it ony needs to force in 2 drives, so it > takes the two most recent drives and uses them. They will have all > the data on them, but no redundancy. > > I suggest that after assembling the array, you 'fsck' the filesystem > on md0 just to make sure that the data is fine and then simply hot-add > the third device: > mdadm /dev/md0 -a /dev/sdc > > If fsck reports lots of error..... maybe try force the assmbly from a > different pair of drives. e.g. > mdadm -A --force /dev/sda1 /dev/sdc2 > > and then do the fsck. > > NeilBrown hi again and sorry for the delayed answer, i had to work a few days "on the road" and could not test your suggestion until some minutes ago! and i worked exactly as you described! great! thanks a lot, thats real cool! what i did exactly (maybe someone else is interested): (i snipped the output) [root@merlin root]# mdadm -A /dev/md0 --force /dev/sda1 /dev/sdb1 /dev/sdc2 [root@merlin root]# fsck.ext3 -n /dev/md0 [root@merlin root]# mdadm /dev/md0 -a /dev/sdc and everything worked, all the data is back again! well, except the fact, that now its a ext2 file system and not ext3, but right now (till the current project is done in about two weeks) thats ok for me, i can (must!) life without a journal file system. thanks again for all your help! markus
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