Ideally there should be a warning if a user gives discard=unmap and
isn't using the SCSI bus. Using the following options allows the guest
to detect the drive as a thinly provisioned drive.
-drive discard=unmap,detect-
zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=none,id=hd
-d
** Attachment added: "2015-12-06-19:20:59-screenshot.png"
https://bugs.launchpad.net/qemu/+bug/1523246/+attachment/4530556/+files/2015-12-06-19%3A20%3A59-screenshot.png
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https://bugs.
Public bug reported:
When model=virtio is used, TRIM is not supported.
# mount -o discard /dev/vda4 /mnt
# mount | tail -1
/dev/vda4 on /mnt type fuseblk
(rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
# fstrim /mnt/
fstrim: /mnt/: the discard operation is not supported
