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I have 7 drives in my server (running Debian Wheezy as dom0 for a Xen hypervisor): An 80GB system drive, 3 x 2TB drives, a 1TB drive and 2x 500GB drives.

The 2TB drives are all part of an mdadm RAID 5 array (and in my ineffable wisdom I didn't label them), whereas the other drives are all managed by SnapRAID and go by the names '1t', '500g1' and '500g2', respectively.

To simplify the information here, I'll show the output of sudo blkid /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1:

/dev/sda1: LABEL="boot" UUID="81db8bc2-6cc1-4272-beab-8c1d667cfa93" TYPE="ext2" 
/dev/sdb1: UUID="e3a5165b-0818-bf51-cfdf-f01bce733365" TYPE="linux_raid_member" 
/dev/sdc1: LABEL="500g1" UUID="1aad0eeb-0fc3-47cc-ad4b-54521f2cd6ee" TYPE="ext4" 
/dev/sdd1: UUID="e3a5165b-0818-bf51-cfdf-f01bce733365" TYPE="linux_raid_member" 
/dev/sde1: LABEL="1t" UUID="778dcc42-c74f-433e-b8c0-5228d0134f14" TYPE="ext4" 
/dev/sdf1: LABEL="500g1" UUID="1aad0eeb-0fc3-47cc-ad4b-54521f2cd6ee" TYPE="ext4" 
/dev/sdg1: LABEL="500g2" UUID="b698ea83-99b2-49c2-90e5-548bff6dcab1" TYPE="ext4" 

In this case, sdb/c/d1 are the 2TB drives, and should all show TYPE="linux_raid_member", but sdc1 shows the UUID/label for sdf1 and sdd1 shows the UUID/label for sdb1 (or it could very well be that sdb1 is showing the UUID/label for sdd1).

I'm trying to get the UUIDs for the 2TB drives so that I can pass them on to a VM for management via mdadm. Is there any relatively straightforward way to sort this out?

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What makes you so sure that the UUIDs are wrong? I am more inclined to think you are wrong than the computer :). –  terdon Jun 4 '13 at 16:24
    
@terdon Mainly because I'm pretty sure two different hard drives can't have identical UUIDs, as in sdb1 and sdd1, and in sdc1 and sdf1. –  lachlanroy Jun 4 '13 at 21:48
    
Ah, point, yes indeed. –  terdon Jun 5 '13 at 1:52

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