Your message dated Thu, 02 Oct 2014 13:29:12 +0400 with message-id <[email protected]> and subject line Re: Bug#763318: qemu-kvm: discard='unmap' not working for qcow2 disks on virtio-scsi controller has caused the Debian Bug report #763318, regarding qemu-kvm: discard='unmap' not working for qcow2 disks on virtio-scsi controller to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 763318: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=763318 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---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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--- Begin Message ---Control: retitle -1 discard does not work with old machine types 01.10.2014 15:48, David Marshall wrote: > Hi, > > Did you see anything obvious in my kvm command line. Yes. You're using -machine pc-0.12, but in 0.12, discard weren't supported, so to honour your request, it is not enabled for the guest. With more recent machine type(s), including default 2.1, it works. Closing this bugreport now. Thanks, /mjt
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