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11-03-2008 02:23 PM
11-03-2008 02:23 PM
Cluster shared storage disk problem
I have 2 HP servers with 11iV1 OS and where service guard is configured on these servers. the servers are then connected to a shared storage disk system with no controllers.
the shared storage contains 4 disks. a logical volume is created on 2 disks and mirrored to 2 other disks.
I have a defected disk on the shared storage. Can you please provide the required steps to replace the defected disk especially that the same logical volume is created on 2 disks and mirrored to 2 other disks.
Thank you in advance
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11-03-2008 04:07 PM
11-03-2008 04:07 PM
Re: Cluster shared storage disk problem
>> I have a defected disk on the shared storage. Can you please provide the required steps to replace the defected disk especially that the same logical volume is created on 2 disks and mirrored to 2 other disks<<
by understanding of your above post looks that you have mirror copies,
remove tha fauly disk
ioscan -fnC disk --> looks disk to be claimed
# vgcfgrestore -n vgxx /dev/rdsk/cxtxdx
# vgchange -a y vgxx
# vgsync vgxx
Script to run to check status of vgsync:
while true
do
pvdisplay -v /dev/dsk/cxtxdx|grep stale|wc -l sleep 5 done
Thanks,
Johnson
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11-03-2008 06:59 PM
11-03-2008 06:59 PM
Re: Cluster shared storage disk problem
1. Find the faulty disk by running:
#ioscan -fnC disk
The disk with Unclaimed status is the faulty one.
#pvchange -a n /dev/rdsk/cxtxdx
2. Replace the faulty disk with new disk.
3. Restore the volume group information the disk
#pvchange -a y /dev/rdsk/cxtxdx
#vgcfgrestore -n /dev/vg01 /dev/rdsk/cxtxdx
#vgchange -a y /dev/vg01
#vgsync vg01
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11-03-2008 11:35 PM
11-03-2008 11:35 PM
Re: Cluster shared storage disk problem
Your above procedures are well noted.
Meantime I have the following question:
Since the same logical volume is configured on 2 disks and Mirrored to 2 other disks using MirrorUX software, does replacing a disk of the 2 mirrored disks cause any data corruption to the whole logical volume?
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11-04-2008 01:16 AM
11-04-2008 01:16 AM
Re: Cluster shared storage disk problem
no data corruption will be cause hence your other mirror copies are ok,
that's the purpose of HPUX -mirror software
Thanks,
Johnson
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11-04-2008 01:35 AM
11-04-2008 01:35 AM
Re: Cluster shared storage disk problem
If you still want to do it safer way follow the below steps.
1. Reduce the mirror from the defective disk
# lvreduce -m 0
2. Replace the defective disk
3. Make sure the disk is online after replacing.(by ioscan)
4. #vgcfgrestore -n
5. #vgchange -a y vgname
6. extend the mirror
#lvextend -m 1
Ganesh.
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11-04-2008 11:57 AM
11-04-2008 11:57 AM
Re: Cluster shared storage disk problem
Meantime can you please advise on which server of the cluster this work should be done?
does it need to be done on both servers or only on one server.
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11-04-2008 10:24 PM
11-04-2008 10:24 PM
Re: Cluster shared storage disk problem
Thanks,
JOhnson
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11-04-2008 11:48 PM
11-04-2008 11:48 PM
Re: Cluster shared storage disk problem
To change the faulty disk please refer this attached doc.
Suraj
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11-04-2008 11:49 PM
11-04-2008 11:49 PM
Re: Cluster shared storage disk problem
here is the attached doc
Suraj