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Date: Tue, 6 Nov 2012 17:42:58 -0500 (EST)
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] scsi-hd with discard_granularity and unmap results
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To: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
Cc: qemu-devel@nongnu.org


> i wantes to use scsi unmap with rbd. rbd documention says you need to
> set discard_granularity=512 for the device. I'm using qemu 1.2.
> 
> If i set this and send an UNMAP command i get this kernel output:

The discard request is failing.  Please check why with a breakpoint on
rbd_aio_discard_wrapper or scsi_handle_rw_error for example.

Paolo