Cluster shared storage disk problem

[Johnny12]

Dear Gurus,

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

[Johnson Punniyalingam]

Hi ,

>> 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

[jaivinder]

To replace the faulty disk follow these steps:

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

[Johnny12]

Dear All,

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?

[Johnson Punniyalingam]

>>> 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? <<<

no data corruption will be cause hence your other mirror copies are ok,

that's the purpose of HPUX -mirror software

Thanks,
Johnson

[Ganesan R]

Hi,

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

[Johnny12]

Thank you for your above replies.

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.

[Johnson Punniyalingam]

if your both "Nodes in the Cluster have the defective disk" you need do for both

Thanks,
JOhnson

[Suraj K Sankari]

Hi,

To change the faulty disk please refer this attached doc.

Suraj

[Suraj K Sankari]

Sorry forget to attached

here is the attached doc

Suraj