How do I get scst_vdisk/IB_SRP(T) to properly handle drives w/ 4KB sectors?

How do I get scst_vdisk/IB_SRP(T) to properly handle drives w/ 4KB sectors?

[Chris Worley]

When given an LBA w/ a bad boundary, the drive returns an error and
the target side says:

dev_vdisk: ***ERROR***: cmd ffff810196f58b70 returned error -22

... and the initiator:

sd 8:0:0:0: SCSI error: return code = 0x08000002
sdc: Current: sense key: Medium Error
    Add. Sense: Unrecovered read error

Is there a way to tell scst that this drive requires 4KB block sizes,
and pass that upstream?

Thanks,

Chris
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Re: How do I get scst_vdisk/IB_SRP(T) to properly handle drives w/ 4KB sectors?

[Vladislav Bolkhovitin]

Chris Worley, on 06/22/2010 08:06 PM wrote:
> When given an LBA w/ a bad boundary, the drive returns an error and
> the target side says:
> 
> dev_vdisk: ***ERROR***: cmd ffff810196f58b70 returned error -22
> 
> ... and the initiator:
> 
> sd 8:0:0:0: SCSI error: return code = 0x08000002
> sdc: Current: sense key: Medium Error
>     Add. Sense: Unrecovered read error
> 
> Is there a way to tell scst that this drive requires 4KB block sizes,
> and pass that upstream?

I'm not sure what you mean here under "tell" and "pass upstream". 
Generally, such problems are outside of SCST scope and responsibilities. 
With vdisk kernel I/O stack should make sure you use correct alignment 
accessing your backend drive and you can always choose your own >512b 
block size for all vdisk devices.

Vlad
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Re: How do I get scst_vdisk/IB_SRP(T) to properly handle drives w/ 4KB sectors?

[Chris Worley]

On Wed, Jun 23, 2010 at 11:08 AM, Vladislav Bolkhovitin <vst-d+Crzxg7Rs0@public.gmane.org> wrote:
> Chris Worley, on 06/22/2010 08:06 PM wrote:
>>
>> When given an LBA w/ a bad boundary, the drive returns an error and
>> the target side says:
>>
>> dev_vdisk: ***ERROR***: cmd ffff810196f58b70 returned error -22
>>
>> ... and the initiator:
>>
>> sd 8:0:0:0: SCSI error: return code = 0x08000002
>> sdc: Current: sense key: Medium Error
>>    Add. Sense: Unrecovered read error
>>
>> Is there a way to tell scst that this drive requires 4KB block sizes,
>> and pass that upstream?
>
> I'm not sure what you mean here under "tell" and "pass upstream". Generally,
> such problems are outside of SCST scope and responsibilities. With vdisk
> kernel I/O stack should make sure you use correct alignment accessing your
> backend drive and you can always choose your own >512b block size for all
> vdisk devices.

DOH!

Thanks,

Chris
>
> Vlad
>
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