Re: [Qemu-devel] [PATCH 0/2] scsi: enclosure support

[Hannes Reinecke]

On 08/04/2017 08:10 AM, Paolo Bonzini wrote:
> 
>> On 08/03/2017 05:10 PM, Paolo Bonzini wrote:
>>> On 03/08/2017 15:26, Hannes Reinecke wrote:
>>>> Hi all,
>>>>
>>>> due to a customer issue I've added simple subenclosure support
>>>> to the SCSI emulation. The patch simply converts the current invisible
>>>> LUN0 into an enclosure device; existing setups using LUN0 as disks or
>>>> CD-ROMs will not be affected.
>>>
>>> What is the issue exactly?  That is, for what is it necessary to have a
>>> dummy enclosure?
>>>
>> Well, stock linux displays some very interesting error messages for
>> these types of enclosures. Which was the prime mover for doing this.
> 
> --verbose?
> 
[   12.958454] scsi 1:0:0:254: Wrong diagnostic page; asked for 2 got 0
[   12.958456] scsi 1:0:0:254: Failed to get diagnostic page 0xffffffea
[   12.958457] scsi 1:0:0:254: Failed to bind enclosure -19
[   12.959392] ses 1:0:0:254: Attached Enclosure device

>>> I agree with Dan that this need machine type compatibility gunk.  For
>>> example, could the new device affect /dev/sgN numbering?
>>
>> Yes, indeed it would.
>>
>> What about a new option to the scsi driver?
> 
> If you do that, you've done 99% of the work to do compatibility so I
> won't complain and do the 1% myself. :)
> 
Okay, will be doing so.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Teamlead Storage & Networking
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