On 24/03/21 14:44, Andy Smith wrote: > But, this being a RAID-1 you have at least two devices so wouldn't > it be safer to: > > - Fail out one device > - Zero that device > - Create new filesystem on the removed device > - Copy data onto it from the still-running array that is currently > degraded > - Use new filesystem for whatever you wanted Better yet just get another drive and copy it across. You can always do a "dd if=/dev/md0 of=/dev/sdc1" or whatever is appropriate. (And before anyone asks, I'm planning to copy a filesystem that way, because it's chokker with hard links. I *really* don't want to cp the contents ...) BUT. If you really do want to break the mirror (as I might, just to see what happens :-), then your best bet is to add a third disk, let it sync, then fail it off and play with that disk. As the others said, if you have a 0.9 or 1.0 superblock, your filesystem starts in the same place as your partition, so if you delete the superblock the partition becomes non-raid. But if your superblock is 1.1 or 1.2, then that won't work. Cheers, Wol
