On Fri, 14 Sep 2012 13:51:46 +0200 Oliver Schinagl <oliver+list@xxxxxxxxxxx> wrote: > Since I had only one valid device to check with etc, I assume that if > fsck -n -f /dev/md2 runs sucessfully, it is 100% safe to assume the > array is perfectly healthy? I might be a bit late here but.... No, not 100% safe. I would at least mount the filesystem and have a look around - take a random sample and see if it all looks credible. If it does then that is as good as it gets. > > E.g. it should be perfectly safe to mdadm --zero-superblock on /dev/sda6 > and add it to /dev/md2 (missing /dev/sdb6)? > > I know technically this all works out fine, and the bug shouldn't have > broken anything in that regard. Or is it absolutly recommended to simply > create a new array, with a new FS on it, and copy all data over > (Logically also with /dev/md2, /dev/sda6 missing and later adding sdb6)? Creating a new array shouldn't be necessary. In general I would avoid copying data when convenient. NeilBrown
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