From: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
To: linux-xfs@oss.sgi.com
Subject: ag selection
Date: Mon, 11 Nov 2013 18:25:13 +0100 [thread overview]
Message-ID: <l5r3tf$m0j$1@ger.gmane.org> (raw)
Hi all,
for streaming writes onto a raid6 the current round-robin ag selection
seems does not seem to be optimal. Writing 4 files from 4 threads into a
single directory we get 900 MB/s, writing 4 files in 4 different
directories we only get 700 MB/s (12 disks with with hw megaraid-sas).
The current round-robin scheme seems to be optimized for linear raid0?
With small AGs one could also argue, that choosing AGs which are not far
away from each other (in respect to the number of blocks) also adds more
parallel disk access for small and medium sized files.
Any objections against a patch to improve the AG selection?
Thanks,
Bernd
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
next reply other threads:[~2013-11-11 17:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-11 17:25 Bernd Schubert [this message]
2013-11-11 17:53 ` ag selection Carlos Maiolino
2013-11-11 17:55 ` Carlos Maiolino
2013-11-11 18:23 ` Bernd Schubert
2013-11-11 18:30 ` Eric Sandeen
2013-11-11 19:42 ` Bernd Schubert
2013-11-11 20:55 ` Dave Chinner
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='l5r3tf$m0j$1@ger.gmane.org' \
--to=bernd.schubert@itwm.fraunhofer.de \
--cc=linux-xfs@oss.sgi.com \
/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