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Re: [Qemu-devel] [PATCH] scsi-disk: add non-zero MAX UNMAP LBA COUNT to
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From: |
Bharata B Rao |
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Subject: |
Re: [Qemu-devel] [PATCH] scsi-disk: add non-zero MAX UNMAP LBA COUNT to block limits VPD page |
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Date: |
Sat, 21 Dec 2013 09:40:56 +0530 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Fri, Dec 20, 2013 at 03:58:08PM +0100, Paolo Bonzini wrote:
> Linux prefers WRITE SAME to UNMAP if the count is zero, and WRITE
> SAME does not discard anything unless the device can guarantee that
> the resulting block is zero.
>
> This fixes thin provisioning on glusterfs.
I don't see discard requests reaching GlusterFS even after this patch.
bdrv_co_discard or bdrv_aio_discard isn't getting called for the gluster
drive.
Regards,
Bharata.