From: Erik Mouw <erik@harddisk-recovery.com>
To: Mirko Benz <mirko.benz@web.de>
Cc: linux-raid@vger.kernel.org
Subject: Re: NVRAM support
Date: Fri, 10 Feb 2006 13:42:05 +0100 [thread overview]
Message-ID: <20060210124204.GC28676@harddisk-recovery.com> (raw)
In-Reply-To: <43EC5655.1060504@web.de>
On Fri, Feb 10, 2006 at 10:01:09AM +0100, 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.
Unless it's very large (i.e.: as large as one of your disks), it
doesn't make sense. It will probably break less often, but it doesn't
help you in case a disk really breaks. It also won't speed up an MD
device much.
> Could that significantly improve write speed for RAID 5/6 (e.g. via an
> external journal, asynchronous operation and write caching)?
You could use it for an external journal, or you could use it as a swap
device.
> What changes would be required?
None, ext3 supports external journals. Look for the -O option in the
mke2fs manual page. Using the NVRAM device as swap is not different
from a using "normal" swap partition.
Erik
--
+-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 --
| Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands
next prev parent reply other threads:[~2006-02-10 12:42 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 [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20060210124204.GC28676@harddisk-recovery.com \
--to=erik@harddisk-recovery.com \
--cc=linux-raid@vger.kernel.org \
--cc=mirko.benz@web.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.