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[linux-lvm] UUID Issue



I am having the same issue as this previous post to the lvm list, but cannot find if anyone ever had a solution for it:

Author: Tommaso Cecchi
Date: 2006-07-19 11:35 -500
To: LVM general discussion and development
Old-Topics: RE: [linux-lvm] "pvchange --uuid" failed when PV is in use
Subject: [linux-lvm] duplicate PV
Hello everyone,
I have the following problem: I want to use a snapshot mechanism external to
LVM2 (i.e. snapshot from the storage server) so it happens that I access from a
linux box two identical LUNs with the same PVID. It is not a matter of
multipathing, they just are completely different devices with the same content
(and with the same PVID of course).

What I would like to do is to use and mount the second device on a different
mount point. So:

/dev/sdd1 is the primary PV
/dev/sdf1 is the snapshot of the primary PV

The result of pvscan before the discovery is:

drdb2:~ # pvscan
PV /dev/sde1 VG drrg2_vg lvm2 [200.00 GB / 0 free]
PV /dev/sdd1 VG test_vg lvm2 [200.00 GB / 0 free]
PV /dev/sdb1 VG oracledb_vg lvm2 [220.00 GB / 0 free]
PV /dev/sdc1 VG oracledb_vg lvm2 [20.00 GB / 0 free]
PV /dev/sda3 VG root_vg lvm2 [59.75 GB / 47.26 GB free]
Total: 5 [699.73 GB] / in use: 5 [699.73 GB] / in no VG: 0 [0 ]

after the discovery of the new device is:

drdb2:~ # pvscan
Found duplicate PV PnvnzL7YFft76Ky0EaPbOh519SQD5Uxc: using /dev/sdf1 not
/dev/sdd1
PV /dev/sde1 VG drrg2_vg lvm2 [200.00 GB / 0 free]
PV /dev/sdd1 VG test_vg lvm2 [200.00 GB / 0 free]
PV /dev/sdb1 VG oracledb_vg lvm2 [220.00 GB / 0 free]
PV /dev/sdc1 VG oracledb_vg lvm2 [20.00 GB / 0 free]
PV /dev/sda3 VG root_vg lvm2 [59.75 GB / 47.26 GB free]
Total: 5 [699.73 GB] / in use: 5 [699.73 GB] / in no VG: 0 [0 ]

I guess this problem is the same I'd have if I copy any single byte from a
device to another the last one resulting in having the same LVM label.

What I tried is to:

1) vgreduce:

drdb2:~ # vgreduce test_vg /dev/sdf1
Found duplicate PV PnvnzL7YFft76Ky0EaPbOh519SQD5Uxc: using /dev/sdf1 not
/dev/sdd1
Physical Volume "/dev/sdf1" not found in Volume Group "test_vg"

sdf1 does not belong to test_vg

2) pvchange --uuid:

drdb2:~ # pvchange --uuid /dev/sdf1
Found duplicate PV PnvnzL7YFft76Ky0EaPbOh519SQD5Uxc: using /dev/sdd1 not
/dev/sdf1
Volume group containing /dev/sdf1 has active logical volumes
0 physical volumes changed / 1 physical volume not changed

My idea was to modify the PVID so to let LVM understand they are completely
different devices.
How can I manage this?

Thanks for any help you may give me.
Tommaso

-- 
================================================================
| Tommaso Cecchi CINECA
| System Management Group Via Magnanelli 6/3 40033
| e-mail: t cecchi ??? Casalecchio di Reno
| Tel: 051/6171411 Bologna - ITALY
| Fax 051/6132198 http://www.cineca.it
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linux-lvm mailing list

Any help is greatly appreciated.

Thanks!

Koree
linux-lvm ???
https://www.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


--
Koree A. Smith, RHCE
--
koreesmith gmail com
koree ameth org
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