Thanks Stefan.
I using the same. Below is the XML.
<disk type='network' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native' discard='unmap'/>
<source protocol='oflame'
name='/dev/of/vdisk/{a30c3997-0ad8-4495-8549-68431abfa84a}'>
<host name='10.209.133.163' port='9999'/>
</source>
<target dev='sda' bus='scsi'/>
<address type='drive' controller='1' bus='0' target='0' unit='0'/>
</disk>
....
<controller type='scsi' index='1' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
</controller>
I am able to see the scsi disk, /dev/sda inside the guest, but does not showing
TRIM supported in the hdparm output. Fstrim command is also failing.
Regards,
Sanjay
-----Original Message-----
From: Stefan Hajnoczi [mailto:stefa...@gmail.com]
Sent: Wednesday, September 03, 2014 4:06 PM
To: Sanjay Kumar2
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Query regarding bdrv_co_discard
On Tue, Sep 02, 2014 at 02:09:44AM -0700, Sanjay Kumar2 wrote:
> Please let me know how to test bdrv_co_discard interface. I mean what steps I
> need to do on KVM host and inside guest to do end to end testing of this
> interface. I have implemented a network protocol based block driver and
> defined bdrv_co_discard interface as well which free the blocks on the remote
> storage device.
Use a virtio-scsi storage controller and then the guest can send SCSI discard
commands. Make sure to use the -drive ...,discard=unmap option, otherwise
discard commands are silently ignored.
Stefan
