From: David Greaves <david@dgreaves.com>
To: alex14641@yahoo.com
Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Sharing disks amoung multiple software RAIDs
Date: Thu, 01 May 2008 13:51:16 +0100 [thread overview]
Message-ID: <4819BCC4.8030504@dgreaves.com> (raw)
In-Reply-To: <771640.4981.qm@web50209.mail.re2.yahoo.com>
Alex Davis wrote:
> Is this a bad thing? I'm guessing that it is, but I want independent
> confirmation before I spoke to someone I know who's doing this.
>
> Thanks
Depends what you're trying to do.
It has the potential to increase i/o contention so it's not going to be a
performance win. Many systems really don't need to worry about performance. But
if you have 2x250 Gb drives and 1x500 Gb drive then your data is at less risk if
you partition the 500Gb into 2x250Gb and then mirror each partition with a full
250Gb disk. That would be a perfectly rational setup in many instances.
Equally, md has a mechanism to share hot spares amongst multiple RAIDs - but I
doubt that's what you meant.
David
next prev parent reply other threads:[~2008-05-01 12:51 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-01 11:35 Sharing disks amoung multiple software RAIDs Alex Davis
2008-05-01 12:50 ` Justin Piszcz
2008-05-01 13:42 ` Alex Davis
2008-05-02 21:24 ` Bill Davidsen
2008-05-02 1:39 ` Kasper Sandberg
2008-05-02 1:51 ` Alex Davis
2008-05-02 2:31 ` David Lethe
2008-05-02 2:42 ` Kasper Sandberg
2008-05-02 7:06 ` David Rees
2008-05-02 8:09 ` Kasper Sandberg
2008-05-02 8:25 ` David Greaves
2008-05-02 21:43 ` Kasper Sandberg
2008-05-02 22:04 ` Alex Davis
2008-05-02 22:24 ` David Lethe
2008-05-03 0:44 ` Alex Davis
2008-05-03 10:13 ` Keld Jørn Simonsen
2008-05-03 3:11 ` Kasper Sandberg
2008-05-02 10:25 ` Keld Jørn Simonsen
[not found] ` <481E0726.1030501@harddata.com>
[not found] ` <20080504212927.GB20650@rap.rap.dk>
[not found] ` <481E3374.4070105@harddata.com>
2008-05-04 23:10 ` Keld Jørn Simonsen
2008-05-04 23:17 ` Keld Jørn Simonsen
2008-05-02 13:43 ` Helge Hafting
2008-05-02 14:13 ` Alex Davis
2008-05-01 12:51 ` David Greaves [this message]
2008-05-02 1:23 ` Nick Andrew
-- strict thread matches above, loose matches on Subject: below --
2008-05-02 8:36 George Spelvin
2008-05-02 11:07 ` Alex Davis
2008-05-02 13:26 ` Richard Michael
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=4819BCC4.8030504@dgreaves.com \
--to=david@dgreaves.com \
--cc=alex14641@yahoo.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-raid@vger.kernel.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).