[linux-lvm] Shared VG, Separate LVs

[Eric Ren]

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

Eric

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