From: Kevin Corry <corryk@us.ibm.com>
To: Jens Axboe <axboe@suse.de>, Joe Thornber <joe@fib011235813.fsnet.co.uk>
Cc: linux-lvm@sistina.com, linux-kernel@vger.kernel.org,
evms-devel@lists.sourceforge.net
Subject: Re: [linux-lvm] Re: [PATCH] 2.5 version of device mapper submission
Date: Tue, 15 Oct 2002 10:06:09 -0500 [thread overview]
Message-ID: <02101510060901.05920@boiler> (raw)
In-Reply-To: <02101509523700.05920@boiler>
On Tuesday 15 October 2002 09:52, Kevin Corry wrote:
> Also, am I correct in assuming that for merge_bvec_fn() to work properly, a
> driver's merge_bvec_fn() must also call the merge_bvec_fn() of the driver
> below it? For example, lets say we have a DM linear device that maps to two
> underlying devices (or in LVM-speak, a linear LV that spans two PVs), both
> of which are MD RAID-1 devices. For a given large request, DM may decide
> that it is fully contained within one of its two target devices, and allow
> all the requested pages to be added to the bio. However, it also needs to
> ask MD what its limits are for that request, or MD would still have to go
> through the trouble to split up the bio after it has been submitted.
This example actually should have been RAID-0 (striping), not RAID-1
(mirroring). Sorry if this caused any confusion.
--
Kevin Corry
corryk@us.ibm.com
http://evms.sourceforge.net/
prev parent reply other threads:[~2002-10-15 15:35 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-09 18:12 [PATCH] 2.5 version of device mapper submission Joe Thornber
2002-10-09 18:31 ` Andrew Morton
2002-10-09 18:44 ` Joe Thornber
2002-10-12 20:05 ` Alan Cox
2002-10-12 20:19 ` Alan Cox
2002-10-14 16:59 ` [linux-lvm] " Austin Gonyou
2002-10-14 17:11 ` Dave Jones
2002-10-14 17:13 ` [linux-lvm] Re: [PATCH] 2.5 version of device mapper submissi on Austin Gonyou
2002-10-14 17:56 ` [linux-lvm] Re: [PATCH] 2.5 version of device mapper submission Joe Thornber
2002-10-14 21:03 ` [linux-lvm] Re: [PATCH] 2.5 version of device mapper submissi on Austin Gonyou
2002-10-15 8:21 ` [linux-lvm] Re: [PATCH] 2.5 version of device mapper submission Jens Axboe
2002-10-15 9:32 ` Joe Thornber
2002-10-15 9:36 ` Jens Axboe
2002-10-15 10:20 ` Joe Thornber
2002-10-15 10:34 ` Jens Axboe
2002-10-15 14:52 ` Kevin Corry
2002-10-15 15:06 ` Kevin Corry [this message]
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