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Wido den Hollander closed CLOUDSTACK-8104. ------------------------------------------ Resolution: Fixed This has been implement by adding VirtIO-SCSI > Add TRIM/Discard support to Qemu > -------------------------------- > > Key: CLOUDSTACK-8104 > URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8104 > Project: CloudStack > Issue Type: New Feature > Components: KVM > Reporter: Wido den Hollander > Assignee: Wido den Hollander > Priority: Minor > Labels: gsoc2017 > > Thinly provisioned volumes on storage devices continue to grow because the > storage device has no idea of which blocks are in use. > For SSDs the TRIM/Discard feature was invented to give free/unused blocks > back to the flash device, but this can also be used for Qemu. > Ceph's RBD for example supports trimming so that volumes can shrink again > when blocks are no longer in use. > This is supported since Qemu 1.5, but since 1.6 it also works for QCOW2 > images. > It however requires the new virtio-scsi to work optimal, so it requires some > changes. > For more information see: > * http://wiki.qemu.org/ChangeLog/1.5#Block_devices > * http://wiki.qemu.org/ChangeLog/1.6#Block_devices > * http://ceph.com/docs/master/rbd/qemu-rbd/#enabling-discard-trim > * http://wiki.qemu.org/Features/VirtioSCSI -- This message was sent by Atlassian JIRA (v6.4.14#64029)