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Re: [Qemu-devel] scsi-hd with discard_granularity and unmap results in A


From: Stefan Priebe
Subject: Re: [Qemu-devel] scsi-hd with discard_granularity and unmap results in Aborted Commands
Date: Sun, 18 Nov 2012 23:00:10 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20121026 Thunderbird/16.0.2

Hi Paolo,

Am 06.11.2012 23:42, schrieb Paolo Bonzini:

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

I'm sorry the discard requests aren't failing. Qemu / Block driver starts to cancel a bunch of requests.

[   39.577194] sd 2:0:0:1: [sdb]
[   39.577194] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[   39.577194] sd 2:0:0:1: [sdb]
[   39.577194] Sense Key : Aborted Command [current]
[   39.577194] sd 2:0:0:1: [sdb]
[   39.577194] Add. Sense: I/O process terminated
[   39.577194] sd 2:0:0:1: [sdb] CDB:
[ 39.577194] Write same(16): 93 08 00 00 00 00 04 7f ff f7 00 62 00 09 00 00
[   39.577194] end_request: I/O error, dev sdb, sector 75497463

Greets,
Stefan



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