[CentOS] Recover RAID

[Christopher Chan]

On Thursday, March 04, 2010 10:09 AM, John R Pierce wrote:
> Jeff Sadino wrote:
>> Do you think I can copy the unknown partition from the second drive
>> onto the first drive and have everything work again?
>
> if there's a md mirror, god knows what will happen when you boot it up
> with both drives present, it oculd decide to mirror the unformatted
> partition to the original, I've seen worse happen when the juju is
> messed with.

Well, he messed up a stripe. Zero chance of recovery.


>
> I think I'd totally wipe the drive you messed with, like zero it.   Then
> boot up the system in single user with just the one drive you didn't
> hose, and BACK UP EVERYTHING ON IT TO EXTERNAL SAFE MEDIA.  use dump or
> something to do the backup that does a proper inode level backup of each
> volume.   then add the wiped/blank drive, and remirror it with the mdadm
> commands to repair the raid, then reboot to normal mode and see if its
> all safe.
>

Won't apply. He can kiss md1 good bye.