From: Jeff Garzik <jgarzik@pobox.com>
To: "Cress, Andrew R" <andrew.r.cress@intel.com>
Cc: "'Matthias Andree'" <matthias.andree@gmx.de>,
Linux-Kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: SCSI Write Cache Enable in 2.4.20?
Date: Thu, 19 Jun 2003 12:56:14 -0400 [thread overview]
Message-ID: <3EF1EB2E.8010702@pobox.com> (raw)
In-Reply-To: <A5974D8E5F98D511BB910002A50A66470B54CBA3@hdsmsx103.hd.intel.com>
Cress, Andrew R wrote:
> IMO, it isn't "necessary", but it is very desirable, and should be the
> default, to disable write cache on SCSI disks for any system that is
> concerned about reliability.
This sounds like a bug, either in an application, or in Linux kernel's
scsi disk implementation.
Data is only guaranteed to be written onto disk following an
fsync(2)-like operation in the application. And in turn, it is the
Linux kernel's responsibility to ensure that such a flush is propagated
all the down to the low-level driver, in my opinion. Sophisticated
hosts can have barriers, and "dumb" hosts can simply call the drive's
flush-cache / sync-cache command.
Jeff
next prev parent reply other threads:[~2003-06-19 16:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-13 18:25 SCSI Write Cache Enable in 2.4.20? Cress, Andrew R
2003-06-13 20:36 ` Matthias Andree
2003-06-19 16:56 ` Jeff Garzik [this message]
2003-06-19 20:58 ` Matthias Andree
-- strict thread matches above, loose matches on Subject: below --
2003-06-12 9:24 Matthias Andree
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