[stgt] WRITE_SAME aio support

[Moussa Ba (moussaba)]

The LUN as seen by VMWare shows WRITE_SAME support.   Not sure what is uses for  discard


-------- Original message --------
From: ronnie sahlberg <ronniesahlberg at gmail.com>
Date: 08/18/2013 16:55 (GMT-08:00)
To: "Moussa Ba (moussaba)" <moussaba at micron.com>
Cc: stgt at vger.kernel.org
Subject: Re: WRITE_SAME aio support


Your initiator uses WS10/16 for unmap/discard ?
(i.e. you mount the filesystem using -o discard in the guest)

STGT currently offers "I support unmapping using both WS10 and 16". We
probably should only do this
for backends that supports these operations,  == bs_rdwr.c and not
indicate support for the others.


What we probably need to do here is to make the support for
WRITESAME10/16 with unmap support optional
on whether the backend supports it.
I can look at adding this once I get some other changes in.



On Wed, Aug 14, 2013 at 2:41 PM, Moussa Ba (moussaba)
<moussaba at micron.com> wrote:
> I am seeing a LOT of WRITE_SAME error messages in the tgt logs. I understand it is not implemented for aio, my question is will this affect array performance . We are using tgt to host datastores for a virtualization workload.
>
>
> tgtd: bs_aio_cmd_submit(211) WRITE_SAME not yet supported for AIO backend
>
>
> Moussa
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