From: Stefan Priebe <s.priebe@profihost.ag>
To: Sage Weil <sage@inktank.com>
Cc: Mark Nelson <mark.nelson@inktank.com>,
Wido den Hollander <wido@widodh.nl>,
"ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: Re: mon disk access pattern
Date: Fri, 15 Jun 2012 22:31:27 +0200 [thread overview]
Message-ID: <4FDB9B9F.10709@profihost.ag> (raw)
In-Reply-To: <Pine.LNX.4.64.1206150930110.4551@cobra.newdream.net>
Am 15.06.2012 18:30, schrieb Sage Weil:
> On Fri, 15 Jun 2012, Mark Nelson wrote:
>> On 06/15/2012 04:51 AM, Wido den Hollander wrote:
>> I think at some point someone mentioned to me that the mon can cause a lot of
>> syncs, so running them on the OSDs without syncfs might be detrimental. For
>> the majority of our internal performance testing I've kept them off the OSDs
>> just to be sure.
>
> Right. The only thing interesting about the mon access pattern is that it
> calls fsync() a lot when healthy, and will call syncfs() or sync() during
> recovery.
But if i have syncfs support does it still matter if they sit on an osd
with a seperate disk? Do you have any iops or bandwith knowledge for the
mon daemon?
Stefan
next prev parent reply other threads:[~2012-06-15 20:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-15 5:52 mon disk access pattern Stefan Priebe - Profihost AG
2012-06-15 9:51 ` Wido den Hollander
2012-06-15 11:34 ` Mark Nelson
2012-06-15 16:30 ` Sage Weil
2012-06-15 20:31 ` Stefan Priebe [this message]
2012-06-18 6:39 ` Stefan Priebe - Profihost AG
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