Re: [libvirt-users] fstrim support in libvirt/qemu guests
On Mon, Nov 3, 2014 at 4:24 PM, Michal Privoznik <mprivozn(a)redhat.com> wrote:
On 01.11.2014 05:30, Dennis Jacobfeuerborn wrote:
>
> Hi,
> I'm trying to find out how to enable fstrim support for libvirt/qemu
> guests. Specifically I'm trying to enable this on a CentOS 7 host (qemu
> 1.5). I searched the web but only found very vague information and no
> clear documentation on the requirements or how to modify the guest xml
> to enable discard/fstrim support.
>
> Can someone point me in the right direction?
One thing that you'll need is the guest agent:
http://wiki.libvirt.org/page/Qemu_guest_agent
Then you can just use:
# virsh domfstrim $dom
Michal
... and probably discard-aware block driver (although I cannot name
anything except virtio-blk which is not supporting trim or will not
support in the near future). Not sure to which part, guest-host
interaction or driver abilities, the initial question belongs.