From: Wido den Hollander <wido@widodh.nl>
To: Vladimir Bashkirtsev <vladimir@bashkirtsev.com>
Cc: ceph-devel <ceph-devel@vger.kernel.org>
Subject: Re: Is there any way to throttle recovery?
Date: Mon, 03 Sep 2012 10:11:47 +0200 [thread overview]
Message-ID: <50446643.2010705@widodh.nl> (raw)
In-Reply-To: <50445150.7080804@bashkirtsev.com>
On 09/03/2012 08:42 AM, Vladimir Bashkirtsev wrote:
> Hello devs,
>
> I have noticed that while ceph recovering from OSD failure RBD
> performance becomes dismal. Judging by load on the net ceph attempts to
> shuffle around huge amount of data leaving virtually no bandwidth for
> normal operations. Is there any way to throttle recovery process?
> Network throttling is out of question as it will slow everything down.
> So I guess ceph should have (or already has) a setting which says do not
> recover faster than X.
>
I don't know if there is a bandwidth throttle, but you could lower the
number of recovery ops with:
osd recovery max active = 1
By default it is set to 5, by tuning this down you'll put less stress on
the OSDs and it will probably also result in less network traffic.
Wido
> Regards,
> Vladimir
> --
> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
prev parent reply other threads:[~2012-09-03 8:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-03 6:42 Is there any way to throttle recovery? Vladimir Bashkirtsev
2012-09-03 8:11 ` Wido den Hollander [this message]
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=50446643.2010705@widodh.nl \
--to=wido@widodh.nl \
--cc=ceph-devel@vger.kernel.org \
--cc=vladimir@bashkirtsev.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 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.