Re: [ovirt-users] "Enable Discard" for Ceph/Cinder Disks?

[Konstantin Shalygin]

according tohttp://docs.ceph.com/docs/luminous/rbd/qemu-rbd/  the use of
Discard/TRIM for Ceph RBD disks is possible. Openstack seems to have
implemented it
(https://www.sebastien-han.fr/blog/2015/02/02/openstack-and-ceph-rbd-discard/).
In oVirt there is no option "Enable Discard" for Cinder Disks (when
choosing IDE or VirtIO-SCSI driver), even when i set
"report_discard_supported = true" in Cinder. Are there plans for
supporting this in the future? Can i use it right now with custom
properties (never tried this before)?

Hello Matthias.
ovirt-engine do not have this option. Earlier I created issue 
https://bugzilla.redhat.com/show_bug.cgi?id=1440230
But you can use unmap with vdsm-hook-diskunmap 
.
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[ovirt-users] "Enable Discard" for Ceph/Cinder Disks?

[Matthias Leopold]

Hi,

according to http://docs.ceph.com/docs/luminous/rbd/qemu-rbd/ the use of 
Discard/TRIM for Ceph RBD disks is possible. Openstack seems to have 
implemented it 
(https://www.sebastien-han.fr/blog/2015/02/02/openstack-and-ceph-rbd-discard/). 
In oVirt there is no option "Enable Discard" for Cinder Disks (when 
choosing IDE or VirtIO-SCSI driver), even when i set 
"report_discard_supported = true" in Cinder. Are there plans for 
supporting this in the future? Can i use it right now with custom 
properties (never tried this before)?


thx
matthias

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