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Date: Tue, 06 Nov 2012 09:41:03 +0100
From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
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Subject: [Qemu-devel] scsi-hd with discard_granularity and unmap results in
	Aborted Commands
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-devel@nongnu.org

Hello list,

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:

Sense Key : Aborted Command [current]
sd 2:0:0:1: [sdb]
Add. Sense: I/O process terminated
sd 2:0:0:1: [sdb] CDB:
Write same(16): 93 08 00 00 00 00 00 00 00 00 00 7f ff ff 00 00
end_request: I/O error, dev sdb, sector 0
sd 2:0:0:1: [sdb]
Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
sd 2:0:0:1: [sdb]
Sense Key : Aborted Command [current]
sd 2:0:0:1: [sdb]
Add. Sense: I/O process terminated
sd 2:0:0:1: [sdb] CDB:
Write same(16): 93 08 00 00 00 00 01 ff ff fc 00 7f ff ff 00 00
end_request: I/O error, dev sdb, sector 33554428
sd 2:0:0:1: [sdb]
Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
sd 2:0:0:1: [sdb]
Sense Key : Aborted Command [current]
sd 2:0:0:1: [sdb]
Add. Sense: I/O process terminated
sd 2:0:0:1: [sdb] CDB:
Write same(16): 93 08 00 00 00 00 00 ff ff fe 00 7f ff ff 00 00
end_request: I/O error, dev sdb, sector 16777214

Greets,
Stefan