Package: qemu-kvm
Version: 2.1+dfsg-4
Severity: normal
Dear Maintainer,
I am not able to get discard to work on qcow2 disks
In my libvirt xml file I have the following:
<devices>
<emulator>/usr/bin/kvm</emulator>
<controller type='scsi' index='0' model='virtio-scsi'/>
................
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none' io='native'
discard='unmap'/>
<source file='/opt/marshall/vm/media-image/david.qcow2'/>
<target dev='sdd' bus='scsi'/>
</disk>
...........
</devices>
>From an lspci in the VM I can see that a virtio-scsi device exists
00:04.0 SCSI storage controller: Red Hat, Inc Virtio SCSI
Subsystem: Red Hat, Inc Device 0008
Physical Slot: 4
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c100 [size=64]
Memory at febf4000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [40] MSI-X: Enable+ Count=4 Masked-
Kernel driver in use: virtio-pci
When I mount the disk I get the following messages in /var/log/kern.log
Sep 29 19:24:51 media kernel: [ 1732.180531] EXT4-fs (sde): mounting with
"discard" option, but the device does not support discard
Sep 29 19:24:51 media kernel: [ 1732.180536] EXT4-fs (sde): mounted filesystem
with ordered data mode. Opts: discard
When I run fstrim I get the following error:
fstrim: /personal/david: FITRIM ioctl failed: Operation not supported
-- System Information:
Debian Release: jessie/sid
APT prefers testing-updates
APT policy: (500, 'testing-updates'), (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 3.14-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages qemu-kvm depends on:
ii qemu-system-x86 2.1+dfsg-4
qemu-kvm recommends no packages.
qemu-kvm suggests no packages.
-- no debconf information
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