From: James Bottomley <James.Bottomley@steeleye.com>
To: "Philip R. Auld" <pauld@egenera.com>
Cc: Mike Christie <mikenc@us.ibm.com>,
Simon Kelley <simon@thekelleys.org.uk>,
SCSI Mailing List <linux-scsi@vger.kernel.org>
Subject: Re: Is there a grand plan for FC failover?
Date: 29 Jan 2004 11:00:58 -0500 [thread overview]
Message-ID: <1075392058.2381.44.camel@mulgrave> (raw)
In-Reply-To: <20040129102430.G11527@vienna.EGENERA.COM>
On Thu, 2004-01-29 at 10:24, Philip R. Auld wrote:
> I think the place to do load balancing would be below the block queue so that
> the IOs are coalesced. IMO, until you've merged the individual block requests
> you can't make a good decision about how to balance the load.
Yes, that's what I think too, so the elevator should go above dm, with a
vestigial elevator between dm and sd simply for SCSI to use in queuing.
Unfortunately, the way it works today is that the elevator is between dm
and sd. I know people are thinking about how to change this, but I'm
not sure how far anyone's got.
James
next prev parent reply other threads:[~2004-01-29 16:01 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-26 14:18 Is there a grand plan for FC failover? Simon Kelley
2004-01-26 15:37 ` James Bottomley
2004-01-28 15:02 ` Philip R. Auld
2004-01-28 16:57 ` James Bottomley
2004-01-28 18:00 ` Philip R. Auld
2004-01-28 20:47 ` Patrick Mansfield
2004-01-28 22:14 ` James Bottomley
2004-01-29 0:55 ` Patrick Mansfield
2004-01-30 19:48 ` [dm-devel] " Joe Thornber
2004-01-31 9:30 ` Jens Axboe
2004-01-31 16:59 ` Philip R. Auld
2004-01-31 17:42 ` Jens Axboe
2004-02-12 15:17 ` Philip R. Auld
2004-02-12 15:28 ` Arjan van de Ven
2004-02-12 16:03 ` Philip R. Auld
2004-01-28 22:37 ` Mike Christie
2004-01-29 15:24 ` Philip R. Auld
2004-01-29 16:00 ` James Bottomley [this message]
2004-01-29 23:25 ` Mike Christie
-- strict thread matches above, loose matches on Subject: below --
2004-01-28 21:02 Smart, James
2004-01-28 22:16 ` James Bottomley
2004-01-29 14:49 ` Philip R. Auld
2004-01-29 15:05 ` James Bottomley
2004-01-29 17:35 Smart, James
2004-01-29 18:31 ` Mike Anderson
2004-01-29 18:31 ` James Bottomley
2004-01-29 18:41 Smart, James
2004-01-29 19:37 Smart, James
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