From: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
To: nikanth@gmail.com
Cc: dm-devel@redhat.com, jens.axboe@oracle.com, agk@redhat.com,
James.Bottomley@hansenpartnership.com, j-nomura@ce.jp.nec.com,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
knikanth@suse.de, k-ueda@ct.jp.nec.com
Subject: Re: [dm-devel] [PATCH 13/13] dm-mpath: convert to request-based
Date: Tue, 28 Oct 2008 12:03:51 -0400 (EDT) [thread overview]
Message-ID: <20081028.120351.78702656.k-ueda@ct.jp.nec.com> (raw)
In-Reply-To: <807b3a220810240055g1dfa4deam3f6a90d6c58aac32@mail.gmail.com>
Hi Nikanth,
On Fri, 24 Oct 2008 13:25:33 +0530, "Nikanth K" wrote:
> On Fri, Sep 12, 2008 at 8:17 PM, Kiyoshi Ueda wrote:
> > This patch converts dm-multipath target to request-based from bio-based.
>
> Can we keep both the bio-based as well as request-based dm-multipath?
Why do you want to keep bio-based dm-multipath?
In the realistic environment, dm-multipath is usually the bottom
of the stacking devices. So I think existing working configurations
are still possible with request-based dm-multipath.
If we keep both types of multipath targets, maintenance cost would
be doubled and additional user interface might be needed to specify
which type is used. I can't see any major benefit worth paying
the cost of keeping bio-based dm-multipath.
I know dm developers sometimes use linear/error maps under multipath
just for testing purpose. If that is your requirement, I can make
request-based targets for linear and error (e.g. named like linear_rq
and error_rq).
Thanks,
Kiyoshi Ueda
next prev parent reply other threads:[~2008-10-28 16:06 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-12 14:38 [PATCH 00/13] request-based dm-multipath Kiyoshi Ueda
2008-09-12 14:40 ` [PATCH 01/13] block: add request update interface Kiyoshi Ueda
2008-09-12 14:41 ` [PATCH 02/13] block: add request submission interface Kiyoshi Ueda
2008-09-14 13:10 ` Boaz Harrosh
2008-09-16 16:06 ` Kiyoshi Ueda
2008-09-16 17:02 ` Jens Axboe
2008-09-16 18:12 ` Kiyoshi Ueda
2008-09-12 14:42 ` [PATCH 03/13] mm: lld busy status exporting interface Kiyoshi Ueda
2008-09-12 14:43 ` [PATCH 04/13] scsi: exports busy status Kiyoshi Ueda
2008-09-12 14:43 ` [PATCH 05/13] block: add a queue flag for request stacking support Kiyoshi Ueda
2008-09-12 14:44 ` [PATCH 06/13] dm: remove unused DM_WQ_FLUSH_ALL Kiyoshi Ueda
2008-09-12 14:44 ` [PATCH 07/13] dm: tidy local_init Kiyoshi Ueda
2008-09-12 14:45 ` [PATCH 08/13] dm: add kmem_cache for request-based dm Kiyoshi Ueda
2008-09-12 14:45 ` [PATCH 09/13] dm: add target interfaces " Kiyoshi Ueda
2008-09-12 14:46 ` [PATCH 10/13] dm: add core functions " Kiyoshi Ueda
2008-10-24 7:44 ` [dm-devel] " Nikanth K
2008-10-28 16:00 ` Kiyoshi Ueda
[not found] ` <490FB852.3FEE.00C5.1@novell.com>
[not found] ` <49102C03020000C50002E257@victor.provo.novell.com>
2008-11-04 15:01 ` Kiyoshi Ueda
2008-09-12 14:46 ` [PATCH 11/13] dm: enable " Kiyoshi Ueda
2008-10-24 7:52 ` [dm-devel] " Nikanth K
2008-10-28 16:02 ` Kiyoshi Ueda
2008-09-12 14:46 ` [PATCH 12/13] dm: reject I/O violating new queue limits Kiyoshi Ueda
2008-09-12 14:47 ` [PATCH 13/13] dm-mpath: convert to request-based Kiyoshi Ueda
2008-10-24 7:55 ` [dm-devel] " Nikanth K
2008-10-28 16:03 ` Kiyoshi Ueda [this message]
2008-09-14 13:17 ` [PATCH 00/13] request-based dm-multipath Jens Axboe
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