Re: [PATCH V3 1/7] Drivers: scsi: storvsc: Change the limits to reflect the values on the host

Hannes Reinecke
2014-07-14T08:57:53Z

On 07/14/2014 10:30 AM, Christoph Hellwig wrote:
> On Mon, Jul 14, 2014 at 08:15:17AM +0200, Hannes Reinecke wrote:
>> Limiting max_lun to 255 will make the driver to _not_ respond to LUNs higher
>> than that; ie Well-known LUN won't work here.
>> Also the SCSI stack will be using REPORT LUNS anyway since you're
>> advertising SPC-2 compliance. So your driver runs into issues if Hyper-V
>> would ever return more than 256 LUNs with the REPORT LUN command or if any
>> of the LUNs has an addressing scheme other than
>> '0x00'.
>> I would suggest to raise this to the technical limit (ie the largest LUN
>> which the _protocol_ supports) and let REPORT LUNS deal with the actual
>> LUNs.
>
> I suspect hypverv doesn't support anything more. For now I'd be
> inclined to just put it in ASAP and if your suggestion works out fix it
> up later, although I'll wait a bit for more review feedback.
>
Okay, that's fine by me.

Cheers,

Hannes
--
Dr. Hannes Reinecke zSeries & Storage
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