From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Burgess Subject: Re: Moron Destroyed RAID6 Array Superblocks Date: Sun, 8 Apr 2007 08:21:58 -0700 Message-ID: <200704081521.l38FLwGU017164@cichlid.com> Return-path: Sender: linux-raid-owner@vger.kernel.org To: aaron@darkpixel.com, linux-raid@vger.kernel.org List-Id: linux-raid.ids >After reading through the linux-raid archives I have been lead to >believe that I can recover my array by doing a --create and listing the >7 drives in the exact order I originally created them in. Is this correct? >If so, the kernel upgrade managed to shuffle the drive names around...is >there any way I can figure out what order they should be in? If you know the old order just boot the old kernel and recreate there If you are using kernel rpms, you always want to 'install' new kernels and not 'upgrade', that keeps both the old and new kernel available. Otherwise, if you pick just 5 for the 7 drives from a raid 6 array it seems to me you have 5 factorial combinations = 120. You could write a script that tries them all and then tests by trying a read-only mount? Good luck. I mashed a 3.5 TB array once by rerunning the lvm creation which zeros the first chunk of the resulting device. I was used to mdadm not hurting user data when creating. Grrr. BTW when you test recreate the array make sure you dont start syncing, thats another reason to just use 5 drives. HTH