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Date: Fri, 10 Aug 2012 14:43:32 +0200
From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
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Subject: Re: [Qemu-devel] virtio-scsi vs. virtio-blk
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel <qemu-devel@nongnu.org>, ronnie sahlberg <ronniesahlberg@gmail.com>

Hi Paolo,

Am 10.08.2012 14:39, schrieb Paolo Bonzini:
> Il 10/08/2012 14:35, Stefan Priebe - Profihost AG ha scritto:
>>>
>>> One way to activate passthough is via scsi-generic:
>>>       Example:
>>>           -device lsi -device scsi-generic,drive=MyISCSI \
>>>           -drive file=iscsi://10.1.1.125/iqn.ronnie.test/1,if=none,id=MyI
>>
>> When i do this the guest system always uses the sym53c8xx kernel module.
>> This results in 70 iops instead of 30000 iops. Is this really correct
>> that it uses the very old sym53c8xx kernel module for this device?
>>
>> used start command:
>> http://pastebin.com/raw.php?i=23fkaQgc
>
> Just replace lsi with virtio-scsi-pci again.  Also, using scsi-block
> instead of scsi-generic should have better performance, but I'm not sure
> Ronnie tested it with libiscsi.

I tried this earlier but this results in:

kvm: -device scsi-block,drive=drive-scsi0: scsi-block: INQUIRY failed
kvm: -device scsi-block,drive=drive-scsi0: Device 'scsi-block' could not 
be initialized

Greets,
Stefan