[libvirt] lvm storage pool destroy problem

[Daniel P. Berrange]

On Thu, Dec 19, 2013 at 01:54:19AM +0500, Umar Draz wrote:
> Hi I am trying to stop the storage pool through php-libvirt api which is a
> LVM volume group.
> 
> when I tried to stop it I got error
> 
> error: internal error Child process (/sbin/vgchange -aln mylvmgrp)
> unexpected exit status 5:   Can't deactivate volume group "mylvmgrp" with 4
> open logical volume(s)
> 
> Then I tried throggh virsh command but the result remain same.
> 
> *root at kvm02:~# virsh pool-destroy vms*
> error: Failed to destroy pool vms
> error: internal error Child process (/sbin/vgchange -aln mylvmgrp)
> unexpected exit status 5:   Can't deactivate volume group "mylvmgrp" with 4
> open logical volume(s)

This indicates some process(s) are still using the logical volumes
so it is preventingn you breaking those apps. This is expected
behaviour.

> 
> The same error also occured if I use direct vgchange -aln on my kvm host,
> but then I tried
> 
> 
> *vgchange -aly mylvmgrp*
> 
> this time its worked

That is a totally different operation -aly *activates* volumes which
is the exact opposite of what 'pool-destroy' needs, which is to
de-activate the volumes

> 
>   14 logical volume(s) in volume group "mylvmgrp" now active
> 
> 1) Now would you please help me? is this libvirt issue? or LVM?
> 2) Is this possible virsh pool-destroy pool also run the vgchange -aly
> instead of -aln

AFAICT, there's no bug here. You just need to stop using the volumes
before stopping the pool.

Daniel
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