using cl_extendvg with vpaths

[dsn1]

Hi, I could do with some help to this question

using hacmp, I want to extend a shared volume group. The disk I want to add to the volume group is on an ESS and under DPO appears on the system as vpathn

There is a command to add a vpath to a volume group extendvg4vp which I would normally use. There is no cl_extendvg4vp command.

Will using the cl_extendvg command successfully add the vpath to the shared volume group or do I have to use a non SPOC method

Dave

 

[StevenLangdale]

Hello Dave

It's been a while since I last looked into this one, but I think you will need to do it manually.

It's Dead easy to do manually, if you want I can post the procedure I use. It's only a few steps if your adding to an already existing VG like you are.

Personally, I prefer to do it myself, you know what it's doing then

Thanks

Steven

 

[dsn1]

I thought that that would be the case and that It'll be a manual task

What do you do?

I was going to extend the vg on primary node
On secondary, varyoff/export the volume group delete the disks on the remote side, recreate them and import the volumegroup

Thanks

Dave

 

[sectorseveng]

Should be simpler than that if you are not talking about concurrent VGs.

On the service node:
1) Acquire the hdisks and convert to vpaths.
2) Add vpaths to VG using extendvg4vp.
3) Create any required LVs/filesystems.
4) Break scsi locks with 'varyonvg -b -u VGNAME'

On failover node(s):
1) Acquire the hdisks and convert to vpaths (compare PVIDs to service node to ensure that you have everything).
2) Update ODM VG data with 'importvg -L VGNAME VPATH#' where VPATH# is one of the pre-existing VPATHs.
3) You may have to convert the VG with hd2vp for the new vpaths.

On service node:
1) Re-establish scsi locks with 'varyonvg VGNAME'.
2) Update resource group with new LVs/filesystems, synchronise & verify.

Note, even if this was doable under CSPOC I'd still extend the VGs the manual way, when you start doing HA then paranoia becomes a co-requisite for every action.