From: Peter Osterlund <petero2@telia.com>
To: Jens Axboe <axboe@suse.de>
Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: [PATCH] 2.4.x write barriers (updated for ext3)
Date: 13 Mar 2002 23:37:24 +0100 [thread overview]
Message-ID: <m2wuwg2ixn.fsf@ppro.localdomain> (raw)
In-Reply-To: <200202281536.g1SFaqF02079@localhost.localdomain> <E16heCm-0000Q5-00@starship.berlin> <10203032021.ZM443706@classic.engr.sgi.com> <E16hl4R-0000Zx-00@starship.berlin> <phillips@bonn-fries.net> <10203032209.ZM424559@classic.engr.sgi.com> <20020304165216.A1444@redhat.com> <3C8AEDFC.502CAD04@torque.net> <20020311121300.G2346@nbkurt.etpnet.phys.tue.nl> <20020312065806.GX704@suse.de>
In-Reply-To: <20020312065806.GX704@suse.de>
Jens Axboe <axboe@suse.de> writes:
> On Mon, Mar 11 2002, Kurt Garloff wrote:
> > disks (DASDs), Write-Once and Optical Memory devices. (Funny enough, the
> > SCSI spec also lists SYNCHRONIZE_CACHE for CD-Rom devices
>
> Hey, I use SYNCHRONIZE_CACHE in the packet writing stuff for CD-ROM's
> all the time :-). Not all are read-only. In fact, Peter Osterlund
> discovered that if you have pending writes on the CD-ROM it's a really
> good idea to sync the cache prior to starting reads or they have a nasty
> tendency to time out.
Not only time out, some drives give up immediately with SK/ASC/ASCQ
05/2c/00 "command sequence error" unless you flush the cache first.
After some googling, I found a plausible explanation for that
behaviour here:
http://www.rahul.net/endl/cdaccess/t10/email/mmc/1997/m9703031.txt
--
Peter Osterlund - petero2@telia.com
http://w1.894.telia.com/~u89404340
next prev parent reply other threads:[~2002-03-13 22:37 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-22 15:57 [PATCH] 2.4.x write barriers (updated for ext3) James Bottomley
2002-02-22 16:10 ` Chris Mason
2002-02-22 16:13 ` Stephen C. Tweedie
2002-02-22 17:36 ` James Bottomley
2002-02-22 18:14 ` Chris Mason
2002-02-28 15:36 ` James Bottomley
2002-02-28 15:55 ` Chris Mason
2002-02-28 17:58 ` Mike Anderson
2002-02-28 18:12 ` Chris Mason
2002-03-01 2:08 ` James Bottomley
2002-03-03 22:11 ` Daniel Phillips
2002-03-04 3:34 ` Chris Mason
2002-03-04 5:05 ` Daniel Phillips
2002-03-04 15:03 ` James Bottomley
2002-03-04 17:04 ` Stephen C. Tweedie
2002-03-04 17:16 ` Chris Mason
2002-03-04 18:05 ` Stephen C. Tweedie
2002-03-04 18:28 ` James Bottomley
2002-03-04 19:55 ` Stephen C. Tweedie
2002-03-04 19:48 ` Daniel Phillips
2002-03-04 19:57 ` Stephen C. Tweedie
2002-03-04 21:06 ` Daniel Phillips
2002-03-05 14:58 ` Stephen C. Tweedie
2002-03-05 7:48 ` Jens Axboe
2002-03-04 19:51 ` Daniel Phillips
2002-03-05 7:42 ` Jens Axboe
2002-03-04 17:35 ` James Bottomley
2002-03-04 17:48 ` Chris Mason
2002-03-04 18:11 ` James Bottomley
2002-03-04 18:41 ` Chris Mason
2002-03-04 21:34 ` Stephen C. Tweedie
2002-03-04 18:09 ` Stephen C. Tweedie
2002-03-04 8:19 ` Helge Hafting
2002-03-04 14:57 ` James Bottomley
2002-03-04 17:24 ` Chris Mason
2002-03-04 19:02 ` Daniel Phillips
2002-03-05 7:22 ` Jeremy Higdon
2002-03-05 23:01 ` Daniel Phillips
2002-03-04 4:21 ` Jeremy Higdon
2002-03-04 5:31 ` Daniel Phillips
2002-03-04 6:09 ` Jeremy Higdon
2002-03-04 7:57 ` Daniel Phillips
2002-03-05 7:09 ` Jeremy Higdon
2002-03-05 22:56 ` Daniel Phillips
2002-03-04 16:52 ` Stephen C. Tweedie
2002-03-04 18:15 ` Daniel Phillips
2002-03-05 7:40 ` Jens Axboe
2002-03-05 22:29 ` Daniel Phillips
2002-03-12 7:01 ` Jens Axboe
2002-03-10 5:24 ` Douglas Gilbert
2002-03-11 11:13 ` Kurt Garloff
2002-03-12 1:17 ` GOTO Masanori
2002-03-12 6:58 ` Jens Axboe
2002-03-13 22:37 ` Peter Osterlund [this message]
2002-03-11 11:34 ` Stephen C. Tweedie
2002-03-11 17:15 ` James Bottomley
2002-03-04 14:48 ` James Bottomley
2002-03-06 13:59 ` Daniel Phillips
2002-03-06 14:34 ` James Bottomley
2002-02-25 10:57 ` Helge Hafting
2002-02-25 15:04 ` James Bottomley
-- strict thread matches above, loose matches on Subject: below --
2002-03-01 15:26 Dieter Nützel
2002-03-01 16:00 ` James Bottomley
2002-02-21 23:30 Chris Mason
2002-02-22 14:19 ` Stephen C. Tweedie
2002-02-22 15:26 ` Chris Mason
2002-01-10 9:55 [ANNOUNCE] FUSE: Filesystem in Userspace 0.95 Miklos Szeredi
2002-01-13 3:10 ` Pavel Machek
2002-01-21 10:18 ` Miklos Szeredi
2002-01-23 10:47 ` Pavel Machek
2002-01-22 19:07 ` Daniel Phillips
2002-01-23 2:33 ` [Avfs] " Justin Mason
2002-01-23 5:26 ` Daniel Phillips
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