From: Paul Clements <paul.clements@steeleye.com>
To: Mirko Benz <mirko.benz@web.de>
Cc: linux-raid@vger.kernel.org
Subject: Re: NVRAM support
Date: Fri, 10 Feb 2006 12:38:38 -0500 [thread overview]
Message-ID: <43ECCF9E.5050102@steeleye.com> (raw)
In-Reply-To: <43EC5655.1060504@web.de>
Mirko Benz wrote:
> Does a high speed NVRAM device makes sense for Linux SW RAID? E.g. a PCI
> card that exports battery backed memory.
Sure. There are a couple ways I can think of using such a thing:
1) put an md intent bitmap on the NVRAM device for faster resyncs
2) use the NVRAM as a write journal for md to make md raid4/5/6 reliable
(if the system crashes while an md raid5 is degraded, i.e., missing a
disk, there is a chance of silent data corruption). The md driver does
not currently do write journalling, so this would require some code changes.
--
Paul
prev parent reply other threads:[~2006-02-10 17:38 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-10 9:01 NVRAM support Mirko Benz
2006-02-10 12:42 ` Erik Mouw
2006-02-10 15:43 ` Bill Davidsen
2006-02-11 1:02 ` dean gaudet
2006-02-13 9:22 ` Erik Mouw
2006-02-13 11:54 ` Andy Smith
2006-02-13 13:35 ` Guy
2006-02-14 10:17 ` Erik Mouw
2006-02-15 8:24 ` Mirko Benz
2006-02-15 23:00 ` Neil Brown
2006-02-16 10:05 ` Mario 'BitKoenig' Holbe
2006-02-20 9:57 ` Mirko Benz
2006-02-20 23:16 ` Neil Brown
2006-02-10 17:38 ` Paul Clements [this message]
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