The LUN as seen by VMWare shows WRITE_SAME support. Not sure what is uses for discard -------- Original message -------- From: ronnie sahlberg <ronniesahlberg@xxxxxxxxx> Date: 08/18/2013 16:55 (GMT-08:00) To: "Moussa Ba (moussaba)" <moussaba@xxxxxxxxxx> Cc: stgt@xxxxxxxxxxxxxxx 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@xxxxxxxxxx> 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 > -- > To unsubscribe from this list: send the line "unsubscribe stgt" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe stgt" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe stgt" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
