From: Lars Marowsky-Bree <lmb@suse.de>
To: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: [RFC] Multi-path IO in 2.5/2.6 ?
Date: Tue, 10 Sep 2002 15:04:27 +0200 [thread overview]
Message-ID: <20020910130427.GP2992@marowsky-bree.de> (raw)
In-Reply-To: <10209100055.ZM65139@classic.engr.sgi.com>
On 2002-09-10T00:55:58,
Jeremy Higdon <jeremy@classic.engr.sgi.com> said:
> Is there any plan to do something for hardware RAIDs in which two different
> RAID controllers can get to the same logical unit, but you pay a performance
> penalty when you access the lun via both controllers?
This is implemented in the md multipath patch in 2.4; it distinguishes between
"active" and "spare" paths.
The LVM1 patch also does this by having priorities for each path and only
going to the next priority group if all paths in the current one have failed,
which IMHO is slightly over the top but there is always someone who might need
it ;-)
This functionality is a generic requirement IMHO.
Sincerely,
Lars Marowsky-Brée <lmb@suse.de>
--
Immortality is an adequate definition of high availability for me.
--- Gregory F. Pfister
next prev parent reply other threads:[~2002-09-10 13:04 UTC|newest]
Thread overview: 269+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200209091458.g89Evv806056@localhost.localdomain>
2002-09-09 16:56 ` [RFC] Multi-path IO in 2.5/2.6 ? Patrick Mansfield
2002-09-09 17:34 ` James Bottomley
2002-09-09 18:40 ` Mike Anderson
2002-09-10 13:02 ` Lars Marowsky-Bree
2002-09-10 16:03 ` Patrick Mansfield
2002-09-10 16:27 ` Mike Anderson
2002-09-10 0:08 ` Patrick Mansfield
2002-09-10 7:55 ` Jeremy Higdon
2002-09-10 13:04 ` Lars Marowsky-Bree [this message]
2002-09-10 16:20 ` Patrick Mansfield
2002-09-10 13:16 ` Lars Marowsky-Bree
2002-09-10 19:26 ` Patrick Mansfield
2002-09-11 14:20 ` James Bottomley
2002-09-11 19:17 ` Lars Marowsky-Bree
2002-09-11 19:37 ` James Bottomley
2002-09-11 19:52 ` Lars Marowsky-Bree
2002-09-11 21:38 ` Oliver Xymoron
2002-09-11 20:30 ` Doug Ledford
2002-09-11 21:17 ` Mike Anderson
2002-09-10 17:21 ` Patrick Mochel
2002-09-10 18:42 ` Patrick Mansfield
2002-09-10 19:00 ` Patrick Mochel
2002-09-10 19:37 ` Patrick Mansfield
2002-11-21 15:16 [PATCH] turn scsi_allocate_device into readable code Christoph Hellwig
2002-11-21 15:36 ` Doug Ledford
2002-11-21 15:39 ` J.E.J. Bottomley
2002-11-21 15:49 ` Doug Ledford
2002-11-21 16:12 ` J.E.J. Bottomley
2002-11-21 17:08 ` [PATCH] current scsi-misc-2.5 include files Patrick Mansfield
-- strict thread matches above, loose matches on Subject: below --
2002-11-16 19:40 [PATCH] removel useless mod use count manipulation Christoph Hellwig
2002-11-17 2:59 ` Doug Ledford
2002-11-17 17:31 ` J.E.J. Bottomley
2002-11-17 18:14 ` Doug Ledford
2002-11-17 12:40 ` Douglas Gilbert
2002-11-17 12:48 ` Christoph Hellwig
2002-11-17 13:38 ` Douglas Gilbert
2002-11-15 20:34 [RFC][PATCH] move dma_mask into struct device J.E.J. Bottomley
2002-11-16 0:19 ` Mike Anderson
2002-11-16 14:48 ` J.E.J. Bottomley
2002-11-16 20:33 ` Patrick Mansfield
2002-11-17 15:07 ` J.E.J. Bottomley
2002-11-06 22:18 [PATCH] add request prep functions to SCSI J.E.J. Bottomley
2002-11-06 23:16 ` Doug Ledford
2002-11-06 23:43 ` J.E.J. Bottomley
2002-11-07 21:45 ` Mike Anderson
2002-11-06 4:24 [PATCH] fix 2.5 scsi queue depth setting Patrick Mansfield
2002-11-06 4:35 ` Patrick Mansfield
2002-11-06 17:15 ` J.E.J. Bottomley
2002-11-06 17:47 ` J.E.J. Bottomley
2002-11-06 18:24 ` Patrick Mansfield
2002-11-06 18:32 ` J.E.J. Bottomley
2002-11-06 18:39 ` Patrick Mansfield
2002-11-06 18:50 ` J.E.J. Bottomley
2002-11-06 19:50 ` Patrick Mansfield
2002-11-06 20:45 ` Doug Ledford
2002-11-06 21:19 ` J.E.J. Bottomley
2002-11-06 20:50 ` Doug Ledford
[not found] <patmans@us.ibm.com>
2002-10-15 16:55 ` [RFC PATCH] consolidate SCSI-2 command lun setting Patrick Mansfield
2002-10-15 20:29 ` James Bottomley
2002-10-15 22:00 ` Patrick Mansfield
2002-10-30 16:58 ` [PATCH] 2.5 current bk fix setting scsi queue depths Patrick Mansfield
2002-10-30 17:17 ` James Bottomley
2002-10-30 18:05 ` Patrick Mansfield
2002-10-31 0:44 ` James Bottomley
2002-10-21 19:34 [PATCH] get rid of ->finish method for highlevel drivers Christoph Hellwig
2002-10-21 23:58 ` James Bottomley
2002-10-22 15:48 ` James Bottomley
2002-10-22 18:43 ` Patrick Mansfield
2002-10-22 23:17 ` Mike Anderson
2002-10-22 23:30 ` Doug Ledford
2002-10-23 14:16 ` James Bottomley
2002-10-23 15:13 ` Christoph Hellwig
2002-10-24 1:36 ` Patrick Mansfield
2002-10-24 23:20 ` Willem Riede
2002-10-24 23:36 ` Christoph Hellwig
2002-10-25 0:02 ` Willem Riede
2002-10-22 7:30 ` Mike Anderson
2002-10-22 11:14 ` Christoph Hellwig
2002-10-15 18:55 [patch 2.5] ips queue depths Jeffery, David
2002-10-15 19:30 ` Dave Hansen
2002-10-15 19:47 ` Doug Ledford
2002-10-15 20:04 ` Patrick Mansfield
2002-10-15 20:52 ` Doug Ledford
2002-10-15 23:30 ` Patrick Mansfield
2002-10-15 23:56 ` Luben Tuikov
2002-10-16 2:32 ` Doug Ledford
2002-10-16 19:04 ` Patrick Mansfield
2002-10-16 20:15 ` Doug Ledford
2002-10-17 0:39 ` Luben Tuikov
2002-10-17 17:01 ` Mike Anderson
2002-10-17 21:13 ` Luben Tuikov
2002-10-15 20:10 ` Mike Anderson
2002-10-15 20:24 ` Doug Ledford
2002-10-15 20:38 ` James Bottomley
2002-10-15 22:10 ` Mike Anderson
2002-10-16 1:04 ` James Bottomley
2002-10-15 20:24 ` Mike Anderson
2002-10-15 22:46 ` Doug Ledford
2002-10-15 20:26 ` Luben Tuikov
2002-10-15 21:27 ` Patrick Mansfield
2002-10-16 0:43 ` Luben Tuikov
2002-10-21 7:28 ` Mike Anderson
2002-10-21 16:16 ` Doug Ledford
2002-10-21 16:29 ` James Bottomley
2002-10-10 15:01 [PATCH] scsi host cleanup 3/3 (driver changes) Stephen Cameron
2002-10-10 16:46 ` Mike Anderson
2002-10-10 16:59 ` James Bottomley
2002-10-10 20:05 ` Mike Anderson
[not found] <dledford@redhat.com>
2002-10-02 0:28 ` PATCH: scsi device queue depth adjustability patch Doug Ledford
2002-10-02 1:16 ` Alan Cox
2002-10-02 1:41 ` Doug Ledford
2002-10-02 13:44 ` Alan Cox
2002-10-02 21:41 ` James Bottomley
2002-10-02 22:18 ` Doug Ledford
2002-10-02 23:19 ` James Bottomley
2002-10-03 12:46 ` James Bottomley
2002-10-03 16:35 ` Doug Ledford
2002-10-04 1:40 ` Jeremy Higdon
2002-10-03 14:25 ` James Bottomley
2002-10-03 16:41 ` Doug Ledford
2002-10-03 17:00 ` James Bottomley
2002-10-16 21:35 ` scsi_scan.c question Doug Ledford
2002-10-16 21:41 ` James Bottomley
2002-10-17 0:18 ` Doug Ledford
2002-10-16 21:57 ` Patrick Mansfield
2002-10-18 15:57 ` Patrick Mansfield
2002-11-18 0:27 ` aic7xxx_biosparam Doug Ledford
2002-11-18 0:36 ` aic7xxx_biosparam J.E.J. Bottomley
2002-11-18 2:46 ` aic7xxx_biosparam Doug Ledford
2002-11-18 3:20 ` aic7xxx_biosparam J.E.J. Bottomley
2002-11-18 3:26 ` aic7xxx_biosparam Doug Ledford
2002-11-18 0:43 ` aic7xxx_biosparam Andries Brouwer
2002-11-18 2:47 ` aic7xxx_biosparam Doug Ledford
2002-11-18 0:57 ` aic7xxx_biosparam Alan Cox
2002-11-18 2:34 ` aic7xxx_biosparam Doug Ledford
2002-12-21 1:22 ` scsi_scan changes Doug Ledford
2002-12-21 1:27 ` James Bottomley
2002-09-30 21:06 [PATCH] first cut at fixing unable to requeue with no outstanding commands James Bottomley
2002-09-30 23:28 ` Mike Anderson
2002-10-01 0:38 ` James Bottomley
2002-10-01 15:01 ` Patrick Mansfield
2002-10-01 15:14 ` James Bottomley
2002-10-01 16:23 ` Mike Anderson
2002-10-01 16:30 ` James Bottomley
2002-10-01 20:18 ` Inhibit auto-attach of scsi disks ? Scott Merritt
2002-10-02 0:46 ` Alan Cox
2002-10-02 1:49 ` Scott Merritt
2002-10-02 1:58 ` Doug Ledford
2002-10-02 2:45 ` Scott Merritt
2002-10-02 13:40 ` Alan Cox
2002-09-24 11:35 SCSI woes (followup) Russell King
2002-09-24 13:46 ` James Bottomley
2002-09-24 13:58 ` Russell King
2002-09-24 14:29 ` James Bottomley
2002-09-24 18:16 ` Luben Tuikov
2002-09-24 18:18 ` Patrick Mansfield
2002-09-24 19:01 ` Russell King
2002-09-24 19:08 ` Mike Anderson
2002-09-24 19:21 ` Russell King
2002-09-24 19:32 ` Patrick Mansfield
2002-09-24 20:00 ` Russell King
2002-09-24 22:23 ` Patrick Mansfield
2002-09-24 23:04 ` Russell King
2002-09-24 22:39 ` Russell King
2002-09-24 23:14 ` James Bottomley
2002-09-24 23:26 ` Mike Anderson
2002-09-24 23:31 ` James Bottomley
2002-09-24 23:56 ` Mike Anderson
2002-09-24 23:33 ` Russell King
2002-09-25 0:47 ` Mike Anderson
2002-09-25 8:45 ` Russell King
2002-09-25 2:18 ` Doug Ledford
2002-09-25 14:41 ` Russell King
2002-09-24 23:33 ` Mike Anderson
2002-09-24 23:45 ` Russell King
2002-09-25 0:08 ` Patrick Mansfield
2002-09-25 8:41 ` Russell King
2002-09-25 17:22 ` Patrick Mansfield
2002-09-25 12:46 ` Russell King
2002-09-24 17:57 ` Luben Tuikov
2002-09-24 18:39 ` Mike Anderson
2002-09-24 18:49 ` Luben Tuikov
2002-09-03 14:35 aic7xxx sets CDR offline, how to reset? James Bottomley
2002-09-03 18:23 ` Doug Ledford
2002-09-03 19:09 ` James Bottomley
2002-09-03 20:59 ` Alan Cox
2002-09-03 21:32 ` James Bottomley
2002-09-03 21:54 ` Alan Cox
2002-09-03 22:50 ` Doug Ledford
2002-09-03 23:28 ` Alan Cox
2002-09-04 7:40 ` Jeremy Higdon
2002-09-04 16:24 ` James Bottomley
2002-09-04 17:13 ` Mike Anderson
2002-09-05 9:50 ` Jeremy Higdon
2002-09-04 16:13 ` James Bottomley
2002-09-04 16:50 ` Justin T. Gibbs
2002-09-05 9:39 ` Jeremy Higdon
2002-09-05 13:35 ` Justin T. Gibbs
2002-09-05 23:56 ` Jeremy Higdon
2002-09-06 0:13 ` Justin T. Gibbs
2002-09-06 0:32 ` Jeremy Higdon
2002-09-03 21:13 ` Doug Ledford
2002-09-03 21:48 ` James Bottomley
2002-09-03 22:42 ` Doug Ledford
2002-09-03 22:52 ` Doug Ledford
2002-09-03 23:29 ` Alan Cox
2002-09-04 21:16 ` Luben Tuikov
2002-09-04 10:37 ` Andries Brouwer
2002-09-04 10:48 ` Doug Ledford
2002-09-04 11:23 ` Alan Cox
2002-09-04 16:25 ` Rogier Wolff
2002-09-04 19:34 ` Thunder from the hill
2002-09-03 21:24 ` Patrick Mansfield
2002-09-03 22:02 ` James Bottomley
2002-09-03 23:26 ` Alan Cox
2002-08-26 16:29 [RFC]: 64 bit LUN/Tags, dummy device in host_queue, host_lock <-> LLDD reentrancy Aron Zeh
2002-08-26 16:48 ` James Bottomley
2002-08-26 17:27 ` Mike Anderson
2002-08-26 19:00 ` James Bottomley
2002-08-26 20:57 ` Mike Anderson
2002-08-26 21:10 ` James Bottomley
2002-08-26 22:38 ` Mike Anderson
2002-08-26 22:56 ` Patrick Mansfield
2002-08-26 23:10 ` Doug Ledford
2002-08-28 14:38 ` James Bottomley
2002-08-26 21:15 ` Mike Anderson
2002-08-12 23:38 [PATCH] 2.5.31 scsi_error.c cleanup Mike Anderson
2002-08-22 14:05 ` James Bottomley
2002-08-22 16:34 ` Mike Anderson
2002-08-22 17:11 ` James Bottomley
2002-08-22 20:10 ` Mike Anderson
2002-08-05 23:53 When must the io_request_lock be held? Jamie Wellnitz
2002-08-06 17:58 ` Mukul Kotwani
2002-08-07 14:48 ` Doug Ledford
2002-08-07 15:26 ` James Bottomley
2002-08-07 16:18 ` Doug Ledford
2002-08-07 16:48 ` James Bottomley
2002-08-07 18:06 ` Mike Anderson
2002-08-07 23:17 ` James Bottomley
2002-08-08 19:28 ` Luben Tuikov
2002-08-07 16:55 ` Patrick Mansfield
[not found] <200206132126.g5DLQiQ24889@localhost.localdomain>
2002-06-13 21:50 ` Proposed changes to generic blk tag for use in SCSI (1/3) Doug Ledford
2002-06-13 22:09 ` James Bottomley
2002-06-11 2:46 James Bottomley
2002-06-11 5:50 ` Jens Axboe
2002-06-11 14:29 ` James Bottomley
2002-06-11 14:45 ` Jens Axboe
2002-06-11 16:39 ` James Bottomley
2002-06-13 21:01 ` Doug Ledford
2002-06-13 21:26 ` James Bottomley
2002-04-08 15:18 [RFC] Persistent naming of scsi devices sullivan
2002-04-08 15:04 ` Christoph Hellwig
2002-04-08 15:59 ` Matthew Jacob
2002-04-08 16:34 ` James Bottomley
2002-04-08 18:27 ` Patrick Mansfield
2002-04-08 19:17 ` James Bottomley
2002-04-09 0:22 ` Douglas Gilbert
2002-04-09 14:35 ` sullivan
2002-04-09 14:55 ` sullivan
2002-04-08 17:51 ` Oliver Neukum
2002-04-08 18:01 ` Christoph Hellwig
2002-04-08 18:18 ` Matthew Jacob
2002-04-08 18:28 ` James Bottomley
2002-04-08 18:34 ` Matthew Jacob
2002-04-08 19:07 ` James Bottomley
2002-04-08 20:41 ` Matthew Jacob
2002-04-08 18:45 ` Tigran Aivazian
2002-04-08 20:18 ` Eddie Williams
2002-04-09 0:48 ` Kurt Garloff
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