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Old 08-29-2013, 09:14 AM   #1
kingston
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Shared volume groups in Linux


Hi

Recently i have been given couple linux servers to administer which was earlier managed by another vendor. In these servers, i could see the LUNs assigned from Storage are shared to all the servers and even the Volume Groups. These servers are not in cluster setup. Can someone tell me, how it might have been configured? It will help me to manage in case any of failure/crash.

Details are:
OS: RHEL 6.2

Server1:

[root@rhel01 ~]# vgdisplay -v vg08recom6 |grep -i "PV UUID"
Using volume group(s) on command line
Finding volume group "vg08recom6"
Found duplicate PV UJVyGtu1VFoQjSkhTrIReCBAq702roS4: using /dev/sdag not /dev/sdq
PV UUID iGdYvn-kma2-8kzH-rHQ8-P1l1-tImu-sBwC3w
[root@rhel01 ~]# vgdisplay -v vg08recom6 |grep -i "PV UUID" |tail -1
PV UUID iGdYvn-kma2-8kzH-rHQ8-P1l1-tImu-sBwC3w
[root@rhel01 ~]# vgs
Found duplicate PV UJVyGtu1VFoQjSkhTrIReCBAq702roS4: using /dev/sdag not /dev/sdq
VG #PV #LV #SN Attr VSize VFree
VolGroup00 1 7 0 wz--n- 136.50g 37.88g
vg01 1 16 0 wz--n- 891.00g 9.00g
vg02 1 7 0 wz--n- 257.00g 4.00g
vg03 1 7 0 wz--n- 256.00g 3.00g
vg04 1 9 0 wz--n- 446.00g 5.00g
vg05 1 1 0 wz--n- 1.37t 0
vg06 1 1 0 wz--n- 400.00g 0
vg07 1 1 0 wz--n- 400.00g 0
vg08 1 1 0 wz--n- 700.00g 0

Server 2:
[root@rhel02 ~]# vgdisplay -v vg08recom6 |grep -i "PV UUID" |tail -1
PV UUID iGdYvn-kma2-8kzH-rHQ8-P1l1-tImu-sBwC3w
[root@rhel02 ~]# vgs
Found duplicate PV UJVyGtu1VFoQjSkhTrIReCBAq702roS4: using /dev/sdag not /dev/sdq
VG #PV #LV #SN Attr VSize VFree
vg01 1 16 0 wz--n- 891.00g 9.00g
vg02 1 7 0 wz--n- 257.00g 4.00g
vg03 1 7 0 wz--n- 256.00g 3.00g
vg04 1 9 0 wz--n- 446.00g 5.00g
vg05 1 1 0 wz--n- 1.37t 0
vg06 1 1 0 wz--n- 400.00g 0
vg07 1 1 0 wz--n- 400.00g 0
vg08 1 1 0 wz--n- 700.00g 0
vg_rhel02 1 3 0 wz--n- 136.21g 0

Please let me know if more inputs are required.
 
Old 08-29-2013, 01:57 PM   #2
jpollard
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There could be lots of different reasons...

Failover from one to another is one possibility, even though it would likely be done manually rather than automatically.

It could have been an error.

It even could be that they are not physically the same, even though the UUID is the same - the groups could have duplicated using an image copy. Usually, leaving the UUIDs the same is an oversight.
 
  


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