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From: Paolo Bonzini <pbonzini@redhat.com>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Mike Snitzer <snitzer@redhat.com>,
	dm-devel@redhat.com, linux-scsi@vger.kernel.org
Subject: Re: SCSI's heuristics for enabling WRITE SAME still need work [was: dm mpath: disable WRITE SAME if it fails]
Date: Tue, 24 Sep 2013 11:37:20 +0200	[thread overview]
Message-ID: <52415D50.508@redhat.com> (raw)
In-Reply-To: <yq1eh8jf8wq.fsf@sermon.lab.mkp.net>

Il 21/09/2013 00:03, Martin K. Petersen ha scritto:
> 
> The major headache here of course is that WRITE SAME is inherently
> destructive. We can't just fire off one during discovery and see if it
> works. For WRITE you can issue a command with a transfer length of 0 to
> see if things work. But unfortunately for WRITE SAME a transfer length
> of zero means "wipe the entire device". Yikes!

What about WRITE SAME with an out-of-range lba?  Or lba equal to the
size of the disk and #blocks equal to zero.

Paolo

  parent reply	other threads:[~2013-09-24  9:37 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-19 16:13 [PATCH] dm mpath: disable WRITE SAME if it fails Mike Snitzer
2013-09-20 21:21 ` SCSI's heuristics for enabling WRITE SAME still need work [was: dm mpath: disable WRITE SAME if it fails] Mike Snitzer
2013-09-20 22:03   ` Martin K. Petersen
2013-09-21 15:28     ` Douglas Gilbert
2013-09-23 18:18     ` Ewan Milne
2013-09-24  5:39       ` [dm-devel] " Hannes Reinecke
2013-09-24 12:34         ` Mike Snitzer
2013-09-24 13:49           ` Martin K. Petersen
2013-09-24 15:15             ` Mike Snitzer
2013-09-25 20:52             ` Bernd Schubert
2013-09-25 22:12               ` Douglas Gilbert
2013-09-26  0:44               ` Martin K. Petersen
2013-09-26  5:39                 ` Douglas Gilbert
2013-09-26 13:41                   ` Bernd Schubert
2013-09-26 14:42                     ` Martin K. Petersen
2013-09-26 15:34                       ` Bernd Schubert
2013-09-26 15:47                       ` Douglas Gilbert
2013-09-26 18:42                         ` Saxena, Sumit
2013-09-24 19:12         ` [dm-devel] " Jeremy Linton
2013-09-24 19:37           ` Douglas Gilbert
2013-09-24  9:37     ` Paolo Bonzini [this message]
2013-09-24 13:25       ` James Bottomley
2013-09-24 18:39   ` [dm-devel] " Mikulas Patocka
2013-09-24 20:44     ` Martin K. Petersen
2013-09-24 22:02       ` Mike Snitzer

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