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https://issues.apache.org/jira/browse/CLOUDSTACK-8104?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wido den Hollander closed CLOUDSTACK-8104.
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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
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