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From: Vladislav Bolkhovitin <vst@vlnb.net>
To: linux-scsi@vger.kernel.org
Subject: SCSI target and IO-throttling
Date: Thu, 02 Mar 2006 19:21:56 +0300	[thread overview]
Message-ID: <44071BA4.3030808@vlnb.net> (raw)

Hello

Could anyone advice how a SCSI target device can IO-throttle its 
initiators, i.e. prevent them from queuing too many commands, please?

I suppose, the best way for doing this is to inform the initiators about 
the maximum queue depth X of the target device, so any of the initiators 
will not send more than X commands. But I have not found anything 
similar to that on INQUIRY or MODE SENSE pages. Have I missed something? 
Just returning QUEUE FULL status doesn't look to be correct, because it 
can lead to out of order commands execution.

Apparently, hardware SCSI targets don't suffer from queuing overflow and 
don't return all the time QUEUE FULL status, so the must be a way to do 
the throttling more elegantly.

Regards,
Vlad

             reply	other threads:[~2006-03-02 16:22 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-03-02 16:21 Vladislav Bolkhovitin [this message]
2006-03-03 18:07 ` SCSI target and IO-throttling Steve Byan
2006-03-03 18:47   ` Stefan Richter
2006-03-03 20:24     ` Steve Byan
2006-03-06 19:15   ` Bryan Henderson
2006-03-06 19:55     ` Steve Byan
2006-03-07 23:32       ` Bryan Henderson
2006-03-08 15:35         ` Vladislav Bolkhovitin
2006-03-08 15:56           ` Steve Byan
2006-03-08 17:49             ` Vladislav Bolkhovitin
2006-03-08 18:09               ` Steve Byan
2006-03-09 18:37                 ` Vladislav Bolkhovitin
2006-03-09 19:32                   ` Steve Byan
2006-03-10 18:46                     ` Vladislav Bolkhovitin
2006-03-10 19:47                       ` Steve Byan
2006-03-13 17:35                         ` Vladislav Bolkhovitin
2006-03-14 20:54                       ` Douglas Gilbert
2006-03-15 17:15                         ` Vladislav Bolkhovitin
2006-03-10 13:26         ` Steve Byan
2006-03-07 17:56     ` Vladislav Bolkhovitin
2006-03-07 18:38       ` Steve Byan
2006-03-07 17:53   ` Vladislav Bolkhovitin
2006-03-07 18:19     ` Steve Byan
2006-03-07 18:46       ` Vladislav Bolkhovitin
2006-03-07 19:00         ` Steve Byan

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