From: "Jim Schutt" <jaschut@sandia.gov>
To: Stefan Priebe <s.priebe@profihost.ag>
Cc: "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: Re: Interesting results
Date: Mon, 2 Jul 2012 08:04:48 -0600 [thread overview]
Message-ID: <4FF1AA80.4070009@sandia.gov> (raw)
In-Reply-To: <4FF0AB99.4060103@profihost.ag>
On 07/01/2012 01:57 PM, Stefan Priebe wrote:
> thanks for sharing. Which btrfs mount options did you use?
-o noatime
is all I use.
-- Jim
>
> Am 29.06.2012 00:37, schrieb Jim Schutt:
>> Hi,
>>
>> Lots of trouble reports go by on the list - I thought
>> it would be useful to report a success.
>>
>> Using a patch (https://lkml.org/lkml/2012/6/28/446)
>> on top of 2.5-rc4 for my OSD servers, the same kernel
>> for my Linux clients, and a recent master branch
>> tip (git://github.com/ceph/ceph commit 4142ac44b3f),
>> I was able to sustain streaming writes from 166 linux
>> clients for 2 hours:
>>
>> On 166 clients:
>> dd conv=fdatasync if=/dev/zero
>> of=/mnt/ceph/stripe-4M/1/zero0.`hostname -s` bs=4k count=65536k
>>
>> Elapsed time: 7274.55 seconds
>> Total data: 45629732.553 MB (43515904 MiB)
>> Aggregate rate: 6272.516 MB/s
>>
>> That kernel patch was critical; without it this test
>> runs into trouble after a few minutes because the
>> kernel runs into trouble looking for pages to merge
>> during page compaction. Also critical were the ceph
>> tunings I mentioned here:
>> http://www.spinics.net/lists/ceph-devel/msg07128.html
>>
>> -- Jim
>>
>> --
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>
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>
next prev parent reply other threads:[~2012-07-02 14:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-28 22:37 Interesting results Jim Schutt
2012-06-28 22:53 ` Mark Nelson
2012-06-29 14:54 ` Jim Schutt
2012-07-01 19:57 ` Stefan Priebe
2012-07-02 14:04 ` Jim Schutt [this message]
2012-07-02 14:07 ` Stefan Priebe - Profihost AG
2012-07-02 14:38 ` Jim Schutt
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