[libvirt-users] Expanding an LVM Storage Pool

[McEvoy, James]

I looked around but could not find any info on how to expand a libvirt managed LVM storage pool.  I do not see any virsh command to do it 
but I was successful using the vgexpand command to add some more storage once I destroyed the pools and then restarted it.  
I'd like to verify that this is the proper way to grow the storage in a libvirt LVM storage pool.  And this brings up a second 
question, I did this without any VM running so I'd like to know what the impact of destroying a running pool is on running VMs.  
Does taking the pool off-line cause any issues with running VMs or is the only affect that the pool is unavailable for management by libvirt?

These are the commands that I ran to create my pool and expand it after a kickstart of the server:

pvcreate -ff -y /dev/mapper/mpath?
virsh pool-define-as --name  GuestVols --type logical --source-dev /dev/mapper/mpatha --target /dev/GuestVols
virsh pool-build GuestVols
virsh pool-start GuestVols
virsh pool-autostart GuestVols
virsh pool-destroy --pool GuestVols
vgextend GuestVols /dev/mapper/mpath{b..d}
vgdisplay GuestVols
virsh pool-start --pool GuestVols
virsh pool-info --pool GuestVols

Is this the best way to create a managed pool across 4 LUNs? And to potentially expand the storage group in the future if more storage is needed?

  --jim