From: Mark Kirkwood <mark.kirkwood@catalyst.net.nz>
To: Dietmar Maurer <dietmar@proxmox.com>
Cc: Alexandre DERUMIER <aderumier@odiso.com>,
Josh Durgin <josh.durgin@inktank.com>,
Dieter Kasper <d.kasper@kabelmail.de>,
"ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>,
Andreas Bluemle <andreas.bluemle@itxperts.de>
Subject: Re: RBD performance - tuning hints
Date: Fri, 31 Aug 2012 20:48:34 +1200 [thread overview]
Message-ID: <50407A62.1020208@catalyst.net.nz> (raw)
In-Reply-To: <24E144B8C0207547AD09C467A8259F755760304F@lisa.maurer-it.com>
On 31/08/12 20:11, Dietmar Maurer wrote:
>>> RBD waits for the data to be on disk on all replicas. It's pretty easy
>>> to relax this to in memory on all replicas, but there's no option for
>>> that right now.
> I thought that is dangerous, because you can loose data?
> N�����r��y���b�X��ǧv�^�){.n�+���z�]z�{ay�\x1dʇڙ�,j\a��f���h���z�\x1e�w���\f���j:+v���w�j�m����\a����zZ+��ݢj"��!tml=
And it is not immediately obvious that this is the bottleneck - from
what I can see the 'sync' call being used (sync_file_range) is extremely
fast and is *not* the major slowdown effect...
Regards
Mark
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next prev parent reply other threads:[~2012-08-31 8:48 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-20 10:24 Ceph write performance George Shuklin
[not found] ` <20120720104150.GA16630@oder.kd-bie.de>
2012-07-20 10:48 ` George Shuklin
2012-07-20 11:49 ` Mark Nelson
2012-07-20 20:36 ` Ceph write performance on RAM-DISK Dieter Kasper
2012-07-20 21:28 ` Mark Nelson
2012-07-20 15:53 ` Ceph write performance Matthew Richardson
2012-07-20 16:37 ` Gregory Farnum
2012-08-28 17:48 ` RBD performance - tuning hints Dieter Kasper
2012-08-28 18:53 ` Smart Weblications GmbH - Florian Wiessner
2012-08-28 19:04 ` Dieter Kasper
2012-08-29 8:50 ` Alexandre DERUMIER
2012-08-29 17:37 ` Josh Durgin
2012-08-29 19:29 ` RBD performance - tuning hints / parameter doc Dieter Kasper
2012-08-29 22:34 ` Samuel Just
2012-08-30 15:08 ` Dieter Kasper
2012-08-30 20:39 ` Samuel Just
2012-08-30 14:56 ` RBD performance - tuning hints Dieter Kasper
2012-08-30 15:28 ` Alexandre DERUMIER
2012-08-30 15:33 ` Dieter Kasper
2012-08-30 15:46 ` Alexandre DERUMIER
2012-08-30 16:02 ` Dieter Kasper
2012-08-30 16:12 ` Alexandre DERUMIER
2012-08-30 16:16 ` Josh Durgin
2012-08-31 7:46 ` Alexandre DERUMIER
2012-08-31 8:11 ` Dietmar Maurer
2012-08-31 8:48 ` Mark Kirkwood [this message]
2012-08-31 9:49 ` RBD performance - tuning hints / major slowdown effect(s) Dieter Kasper
2012-08-31 10:16 ` Mark Kirkwood
2012-08-31 10:58 ` RBD performance - tuning hints Jerker Nyberg
2012-08-30 16:48 ` Dieter Kasper
2012-08-30 18:10 ` Gregory Farnum
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