replace bad drive in OS mirror

[cnhpux01]

HP9000 N class, runnning HPUX B.11 have c1t60 and c2t6d0 in vg00 and OS mirrored.

C2t6d0 drive is bad.

I am going to use this Procedure to replace the bad drive

Hotswap (remove the bad drive then replace the new drive)

#ioscan -fnC disk
#vgcfgrestore -n /dev/vg00 /dev/rdsk/c2t6d0
#vgchange -a y /dev/vg00
#mkboot /dev/rdsk/c2t6d0
#mkboot -a "hpux -lq" /dev/rdsk/c2t6d0
#vgsync /dev/vg00
#lvlnboot -R

Please let me know if this will work

Thanks

-C

[Torsten.]

Follow this:

When_Good_Disks_Go_Bad_WP
http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c01911837/c01911837.pdf

[cnhpux01]

The document is general.

How do I know the system have LVM Online Disk Replacement (LVM OLR) ?

Can I do swap the disk online or single user mode?

Does any one have experience with similiar issue like in this?

Thanks,

-C

[Torsten.]

Do

# man pvchange

if "-a" is listed, you can do OLR.

No need to go into single user mode.

[cnhpux01]

When I do "man pvchange"

did not see option "-a"

only see option "-A"

Remarks: pvchange cannot be performed if the volume group is activated in shared
mode.

Does that mean, cannot do OLR? 

so in this case must perform single usermode?

Do I need to do lvreduce *, vgreduce, remove the bad drive in single usermode?

Thanks,

-C

[pradeep m]

This means that you do not have LVM OLR functionality in that server. In this case you can use any of the below 2 methods.

Method 1:

Remove the disk from the volume group and readding the replaced disk to volume group. This requires the below steps: 
1. Reduce any logical volumes that have the mirror copies on the faulty disk.
2. Remove the PV from the volume group.
3. Replace the faulty disk. 
4. Detect the newly replaced disk with ioscan. 
5. Now follow the steps to Mirror the Root Volume on PA-RISC Servers (Appendix D) as mentioned in the HP whitepaper

When Good Disks Go Bad: Dealing with Disk Failures under LVM: 
http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c01911837/c01911837.pdf

Method 2:

Shut down the system. This halts LVM access to the disk, but makes the entire system inaccessible. Use this option
only if you do not want to remove the disk from the volume group and you cannot deactivate it.

[badgujar_ashish]

the above mentioned step will work witout any issues .

[Ralf_S]

Hello,

my notes cite the same commands. The differences are in the ordering of the commands, which does not make any difference here.

--> It will work.

Bye

Ralf

[cnhpux01 · Accepted solution]

Thanks All,

-C