[GRLUG] LVM Data Recovery

[donlumber at comcast.net]

----- Original Message ----- 
From: "Jim Olding" <olding at smashtech.net> 
To: grlug at grlug.org 
Sent: Wednesday, October 21, 2009 7:18:03 PM GMT -05:00 US/Canada Eastern 
Subject: [GRLUG] LVM Data Recovery 

Well, it finally happened, I had a complete RAID failure. Before it 
comes up, yes, I have the important stuff backed up, but I would still 
like to try getting the data back before just throwing in the towel. 

I'm following the guide here - 
http://www.linuxjournal.com/article/8874 even though it is a bit 
dated. 

Software RAID Setup 
/dev/md0 - RAID1 (1TB /dev/sda and /dev/sbd) 
/dev/md1 - RAID5 (1TB total, 500GB each on /dev/sdc, sdd, and sde) 

LVM Setup 
/dev/vg0 - XFS spanned across both md0 & md1 

sdd had gone out, and I just got the replacement in today. When the 
system started up, sde started throwing errors, which deactivated md1 
(because now its missing 2/3 members). I'm not holding out much hope 
for md1, so I'm wondering if there is some way to bring up the LVM 
group in a 'partial' mode (with just md0), and retrieve any data from 
it. 

You could try to pvremove the offending drives and see if you can access the lvm after they've been removed. 

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