View Single Post
Old 24th July 2009, 11:48
newbuyer17 newbuyer17 is offline
Junior Member
Join Date: Feb 2008
Posts: 12
Thanks: 0
Thanked 1 Time in 1 Post
Default Splitting and reinstating a mdadm RAID mirror for backup

I've managed to set up my system with two drives, and RAID 1 mirror across them both so I am protected in case of a failure using the various howtos on this site. Many thanks for that.

Now what I really want to do is use this setup as a backup for when I do upgrades etc. So when I'm about to do an upgrade I will split the mirror/fail one of the drives, and do the upgrade on the other drive.

If the upgrade works I will then add in the old drive again. Unless anyone can see any issues I believe this is the easy part.

However if the upgrade fails, I'd want to fail my current broken drive and add in the OLD backup disk. This is where I'm a bit unsure. Does failing a disk with mdadm make it useless, or is it still effectively a raid disk that can be used again? If so how would I rebuild the array against this.

My other option is to power down, physically disconnect a drive, then do the upgrade. If it fails I'd then have wipe and disconnect the new broken drive and connect my old one, before adding the new clean drive. I dont see any issues with this working, but its a right pain opening and disconnecting cases.

I thought this would be a common scenario but I'm struggling to find a decent howto. If anyone does it or has any idea how to fail and rebuild from a failed drive that would be very useful.
Thanks in advance
P.S. Not sure what category this should go in, so can the mods please move as required.
Reply With Quote
Sponsored Links