From: Neil Brown <neilb@suse.de>
To: Justin Piszcz <jpiszcz@lucidpixels.com>
Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org
Subject: Re: Software RAID (non-preempt) server blocking question. (2.6.20.4)
Date: Fri, 30 Mar 2007 14:38:48 +1000 [thread overview]
Message-ID: <17932.37976.65001.735686@notabene.brown> (raw)
In-Reply-To: message from Justin Piszcz on Thursday March 29
On Thursday March 29, jpiszcz@lucidpixels.com wrote:
>
> >
> > Did you look at "cat /proc/mdstat" ?? What sort of speed was the check
> > running at?
> Around 44MB/s.
>
> I do use the following optimization, perhaps a bad idea if I want other
> processes to 'stay alive'?
>
> echo "Setting minimum resync speed to 200MB/s..."
> echo "This improves the resync speed from 2.1MB/s to 44MB/s"
> echo 200000 > /sys/block/md0/md/sync_speed_min
> echo 200000 > /sys/block/md1/md/sync_speed_min
> echo 200000 > /sys/block/md2/md/sync_speed_min
> echo 200000 > /sys/block/md3/md/sync_speed_min
> echo 200000 > /sys/block/md4/md/sync_speed_min
>
Yes, well....
You told it to use up to 200MB/s and the drives are only delivering
44MB/s, so they will be taking nearly all of the available bandwidth.
You shouldn't be too surprised if other things suffer.
NeilBrown
next prev parent reply other threads:[~2007-03-30 4:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-27 9:59 Software RAID (non-preempt) server blocking question. (2.6.20.4) Justin Piszcz
2007-03-29 6:25 ` Neil Brown
2007-03-29 8:11 ` Justin Piszcz
2007-03-29 8:56 ` Henrique de Moraes Holschuh
2007-03-29 9:00 ` Justin Piszcz
2007-03-30 4:38 ` Neil Brown [this message]
2007-03-30 8:12 ` Justin Piszcz
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=17932.37976.65001.735686@notabene.brown \
--to=neilb@suse.de \
--cc=jpiszcz@lucidpixels.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).