Re: Shared VG, Separate LVs

[Eric Ren <zren@suse.com>]

Hi,

On 10/13/2017 06:40 PM, Indivar Nair wrote:

Thanks Eric,

I want to keep a single VG so that I can get the bandwidth (LVM Striping) of all the disks (PVs)  

  PLUS 

the flexibility to adjust the space allocation between both LVs. Each LV will be used by  different departments. With 1 LV on different hosts, I can distribute the Network Bandwidth too.

I would also like to take snapshots of each LV before backing up.

I have been reading more about CLVM+Pacemaker options.

I can see that it is possible to have the same VG activated on multiple hosts for a GFSv2 filesystem.

In which case, it is the same PVs, VG and LV getting activated on all hosts.

OK! It sounds reasonable.

In my case, we will have the same PVs and VG activated on both hosts, but LV1 on Host01 and LV2 on Host02. I paln to use ext4 or XFS filesystems.

Is there some possibility that it would work?

As said in the last mail, the new resource agent [4] will probably work for you, but I didn't test this case yet. It's easy to have a try - the RA is just shell
script, you can just copy LVM-activate to /usr/lib/ocf/resource.d/heartbeat/ (assume you've installed resource-agents package), and then configure
"clvm + LVM-activate" for pacemaker [5]. Please report back if it doesn't work for you.

The LVM-activate RA is WIP. We are thinking if we should merge it into the old LVM RA. So it may changes at any time.

[5] https://www.suse.com/documentation/sle-ha-12/book_sleha/data/sec_ha_clvm_config.html

[1] https://github.com/ClusterLabs/resource-agents/blob/master/heartbeat/clvm
[2] https://github.com/ClusterLabs/resource-agents/blob/master/heartbeat/LVM
[3] https://www.redhat.com/archives/linux-lvm/2017-January/msg00025.html
[4] https://github.com/ClusterLabs/resource-agents/pull/1040\

Eric

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