From: "Stephen C. Tweedie" <sct@redhat.com>
To: Jeremy Higdon <jeremy@classic.engr.sgi.com>
Cc: Daniel Phillips <phillips@bonn-fries.net>,
James Bottomley <James.Bottomley@SteelEye.com>,
Chris Mason <mason@suse.com>,
"Stephen C. Tweedie" <sct@redhat.com>,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: [PATCH] 2.4.x write barriers (updated for ext3)
Date: Mon, 4 Mar 2002 16:52:16 +0000 [thread overview]
Message-ID: <20020304165216.A1444@redhat.com> (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>
In-Reply-To: <10203032209.ZM424559@classic.engr.sgi.com>; from jeremy@classic.engr.sgi.com on Sun, Mar 03, 2002 at 10:09:35PM -0800
Hi,
On Sun, Mar 03, 2002 at 10:09:35PM -0800, Jeremy Higdon wrote:
> > WCE is per-command? And 0 means no caching, so the command must complete
> > when the data is on the media?
>
> My reading is that WCE==1 means that the command is complete when the
> data is in the drive buffer.
Even if WCE is enabled in the caching mode page, we can still set FUA
(Force Unit Access) in individual write commands to force platter
completion before commands complete.
Of course, it's a good question whether this is honoured properly on
all drives.
FUA is not available on WRITE6, only WRITE10 or WRITE12 commands.
--Stephen
next prev parent reply other threads:[~2002-03-04 16:53 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 [this message]
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
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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