From: Asdo <asdo@shiftmail.org>
To: Matthieu Patou <mat@matws.net>
Cc: linux-raid <linux-raid@vger.kernel.org>
Subject: Re: Random IO with md raid
Date: Sat, 05 Dec 2009 15:20:24 +0100 [thread overview]
Message-ID: <4B1A6C28.20800@shiftmail.org> (raw)
In-Reply-To: <4B198DBA.5000906@matws.net>
Matthieu Patou wrote:
> * 1 raid 1 volume of 2 1TB hard drive
Are these drives also on the 3ware? Are they exported as jbod?
> * 2 single volume of 1 TB hard drive each
> ...
> Does anyone has an any idea ?
Try anticipatory, deadline and noop schedulers on disks (not CFQ)
Try setting readahead to exactly 4K, or set it to lowest possible value
(I'm not sure what is best), since this is random access...
Increase stripe_cache_size as high as you can, p
Let us/me know the results afterwards...
Thank you
Asdo
next prev parent reply other threads:[~2009-12-05 14:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-04 22:31 Random IO with md raid Matthieu Patou
2009-12-05 14:20 ` Asdo [this message]
2009-12-07 22:59 ` Matthieu Patou
2009-12-09 16:36 ` Goswin von Brederlow
2009-12-14 9:06 ` Matthieu Patou
2009-12-14 10:13 ` Michael Evans
2009-12-16 11:32 ` Goswin von Brederlow
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=4B1A6C28.20800@shiftmail.org \
--to=asdo@shiftmail.org \
--cc=linux-raid@vger.kernel.org \
--cc=mat@matws.net \
/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).