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Re: [linux-lvm] lvm2 confused about double UUID

On 2009-07-26 19:21, Christian Kujau wrote:
The subject says LVM is confused, but maybe it's me who is confused:

I once had a PV made from a single /dev/sdb and all was well. This sdb however was really a 2 disk RAID1 which is now split up, the system now sees both disks, sdb and sdc. Of course, sdb and sdc still have the same UUID:

How did you split the mirrorset?

# blkid  | egrep 'sd[bc]'
/dev/sdb1: UUID="1O2Tkq-9Jy8-VfuZ-uzFh-1f6v-iVBD-hcK6Vq" TYPE="lvm2pv" /dev/sdc1: UUID="1O2Tkq-9Jy8-VfuZ-uzFh-1f6v-iVBD-hcK6Vq" TYPE="lvm2pv"

I decided to continue to use the VG that was set up on the PV, but since lvm comlained[0] about finding the same UUID on more than one device, I tried to instruct lvm to just use sdb for the VG:

Did you reformat sdc before reusing it? (That should give it a new UUID.)

# grep filter /etc/lvm/lvm.conf | grep -v \#
   filter = [ "r|^/dev/sdc1$|", "r|/dev/.*/by-path/.*|", \
              "r|/dev/.*/by-id/.*|", "a/.*/" ]

Now everything looks fine, no more lvm warnings, vg02 seems to use sdb1, exactly as I wanted:

# pvs
PV VG Fmt Attr PSize PFree /dev/sda2 vg01 lvm2 a- 111.67G 9.27G
  /dev/sdb1  vg02 lvm2 a-   931.46G 137.46G

But when I access vg02, I can clearly see I/O to/from sdc! I'd really like to use sdc for something else now that sdb is used for vg02, but I'm afraid to do something to sdc, as it still being used - although I don't know why.

Any ideas?


# lvm version
  LVM version:     2.02.26 (2007-06-15)
  Library version: 1.02.20 (2007-06-15)
  Driver version:  4.12.0
# uname -r
2.6.24-24-xen                      <-- Ubuntu/8.04

Shouldn't you be asking the Ubuntu forum?

[0] e.g.
Found duplicate PV 1O2Tkq9Jy8VfuZuzFh1f6viVBDhcK6Vq: using /dev/disk/by-path/pci-fw1.1-scsi-0:0:0:1-part1 not /dev/sdb1

Scooty Puff, Sr
The Doom-Bringer

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