From: Blair Bethwaite <blair.bethwaite@gmail.com>
To: Wido den Hollander <wido@42on.com>, Wade Holler <wade.holler@gmail.com>
Cc: Ceph Development <ceph-devel@vger.kernel.org>,
"ceph-users@lists.ceph.com" <ceph-users@lists.ceph.com>
Subject: Re: Dramatic performance drop at certain number of objects in pool
Date: Mon, 20 Jun 2016 16:32:22 +1000 [thread overview]
Message-ID: <CA+z5Dsy4tbyiL71C8CQCTQ66tY1=9thSWdNA4BSn6=tNfGUE6w@mail.gmail.com> (raw)
In-Reply-To: <CA+z5DszqHuevkAF3W01R=7AAeqVcyuHZTX0+bAvThgihvOjwuA@mail.gmail.com>
On 20 June 2016 at 09:21, Blair Bethwaite <blair.bethwaite@gmail.com> wrote:
> slow request issues). If you watch your xfs stats you'll likely get
> further confirmation. In my experience xs_dir_lookups balloons (which
> means directory lookups are missing cache and going to disk).
Murphy's a bitch. Today we upgraded a cluster to latest Hammer in
preparation for Jewel/RHCS2. Turns out when we last hit this very
problem we had only ephemerally set the new filestore merge/split
values - oops. Here's what started happening when we upgraded and
restarted a bunch of OSDs:
https://au-east.erc.monash.edu.au/swift/v1/public/grafana-ceph-xs_dir_lookup.png
Seemed to cause lots of slow requests :-/. We corrected it about
12:30, then still took a while to settle.
--
Cheers,
~Blairo
next prev parent reply other threads:[~2016-06-20 6:32 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-16 12:14 Dramatic performance drop at certain number of objects in pool Wade Holler
2016-06-16 12:48 ` Blair Bethwaite
[not found] ` <CA+z5Dsz=e1N9RxRoF5Wao8Dogf_S1UstNZaCJ=oj-efj83HBig-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-16 14:20 ` Dramatic performance drop at certain number ofobjects " Mykola
2016-06-16 14:30 ` Dramatic performance drop at certain number of objects " Wade Holler
2016-06-16 14:32 ` Wade Holler
2016-06-16 13:38 ` Wido den Hollander
2016-06-16 14:47 ` Wade Holler
2016-06-16 16:08 ` Wade Holler
2016-06-17 8:49 ` Wido den Hollander
2016-06-19 23:21 ` Blair Bethwaite
[not found] ` <CA+z5DszqHuevkAF3W01R=7AAeqVcyuHZTX0+bAvThgihvOjwuA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-20 0:52 ` Christian Balzer
2016-06-20 6:32 ` Blair Bethwaite [this message]
[not found] ` <CA+z5Dsy4tbyiL71C8CQCTQ66tY1=9thSWdNA4BSn6=tNfGUE6w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-20 18:48 ` Wade Holler
[not found] ` <CA+e22Sc3iY5Lvp4oGwJ_wwpJsOJsWdB1thaHWEAuYP=bbGHAeg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-20 20:47 ` Warren Wang - ISD
[not found] ` <D38DCB57.131AE%warren.wang-dFwxUrggiyBBDgjK7y7TUQ@public.gmane.org>
2016-06-20 22:58 ` Christian Balzer
2016-06-23 1:26 ` [ceph-users] " Wade Holler
[not found] ` <CA+e22SdrwRHmAD=67MpVtUXVyCOmidcoUXrANZVeDJc2tcJfnQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-23 1:33 ` Blair Bethwaite
2016-06-23 1:41 ` [ceph-users] " Wade Holler
2016-06-23 2:01 ` Blair Bethwaite
2016-06-23 2:28 ` Christian Balzer
2016-06-23 2:36 ` Blair Bethwaite
2016-06-23 2:31 ` Wade Holler
[not found] ` <CA+e22SfaiBUQ9Wanay6_oji9t7131o67B2oDtaEW_zXwqCJfbQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-23 22:09 ` Warren Wang - ISD
[not found] ` <D391D1A4.145D6%warren.wang-dFwxUrggiyBBDgjK7y7TUQ@public.gmane.org>
2016-06-23 22:24 ` Somnath Roy
[not found] ` <BL2PR02MB2115BD5C173011A0CB92F964F42D0-TNqo25UYn65rzea/mugEKanrV9Ap65cLvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2016-06-24 0:08 ` Christian Balzer
[not found] ` <20160624090806.1246b1ff-9yhXNL7Kh0lSCLKNlHTxZM8NsWr+9BEh@public.gmane.org>
2016-06-24 0:09 ` Somnath Roy
2016-06-24 14:23 ` [ceph-users] " Wade Holler
[not found] ` <CA+e22SdmGJVzJX9+63T41UGsfFcxs9R=xZqniQyTgu-yG=h0cA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-24 16:24 ` Warren Wang - ISD
[not found] ` <D392D6EB.146C6%warren.wang-dFwxUrggiyBBDgjK7y7TUQ@public.gmane.org>
2016-06-24 19:45 ` Wade Holler
2016-06-25 3:07 ` [ceph-users] " Christian Balzer
[not found] ` <CAFMfnwoqbr+_c913oyxpvzHNS+NPdXX17dMdXoC1ZiuZM1GzPw@mail.gmail.com>
[not found] ` <CAFMfnwoqbr+_c913oyxpvzHNS+NPdXX17dMdXoC1ZiuZM1GzPw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-27 8:12 ` Blair Bethwaite
2016-06-23 2:37 ` [ceph-users] " Christian Balzer
[not found] ` <20160623113717.446a1f9d-9yhXNL7Kh0lSCLKNlHTxZM8NsWr+9BEh@public.gmane.org>
2016-06-23 2:55 ` Blair Bethwaite
[not found] ` <CA+z5DszcLqV32NnWeuu+WsRZoZwM493Jfy7WcSpVtaDyArwFAQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-23 3:38 ` Christian Balzer
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