From: Andrew Thompson <andrewkt@aktzero.com>
To: "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: Re: Very unbalanced storage
Date: Fri, 31 Aug 2012 12:24:18 -0400 [thread overview]
Message-ID: <5040E532.6040306@aktzero.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1208310908520.1531@cobra.newdream.net>
On 8/31/2012 12:10 PM, Sage Weil wrote:
> On Fri, 31 Aug 2012, Andrew Thompson wrote:
>> Have you been reweight-ing osds? I went round and round with my
>> cluster a few days ago reloading different crush maps only to find
>> that it re-injecting a crush map didn't seem to overwrite reweights.
>> Take a look at `ceph osd tree` to see if the reweight column matches
>> the weight column.
> Note that the ideal situation is for reweight to be 1, regardless of what
> the crush weight is. If you find the utilizations are skewed, I would
> look for other causes before resorting to reweight-by-utilization; it is
> meant to adjust the normal statistical variation you expect from a
> (pseudo)random placement, but if the variance is high there is likely
> another cause.
So if someone(me, guilty) had been messing with reweight, will setting
them all to 1 return it to a normal un-reweight-ed state?
--
Andrew Thompson
http://aktzero.com/
next prev parent reply other threads:[~2012-08-31 16:25 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-31 11:11 Very unbalanced storage Xiaopong Tran
2012-08-31 15:00 ` Andrew Thompson
2012-08-31 16:10 ` Sage Weil
2012-08-31 16:24 ` Andrew Thompson [this message]
2012-08-31 16:39 ` Gregory Farnum
2012-09-01 2:33 ` Xiaopong Tran
2012-09-01 3:07 ` Sage Weil
2012-08-31 16:43 ` Sage Weil
2012-08-31 16:05 ` Sage Weil
2012-09-01 2:52 ` Xiaopong Tran
2012-09-01 3:05 ` Sage Weil
2012-09-01 3:15 ` Xiaopong Tran
2012-09-01 6:58 ` Andrew Thompson
2012-09-04 15:59 ` Tommi Virtanen
2012-09-04 16:19 ` Andrew Thompson
2012-09-04 16:43 ` Sage Weil
2012-09-04 16:48 ` Tommi Virtanen
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