search for: domfstrim

...fy 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.

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? Regards, Dennis

...ar 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

...iscard/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 ques...

I have numerous qcow2 images which need to be reduced in size and have their maximum size (virtual size) reduced. Physical disk space became so low that VMs "auto-paused" themselves, I moved enough images to solve the immediate problem but need to rectify the underlying issue. It seems that qcow[2] files are grown in size such that the data inside of them takes about 50-60% of the