From: Mathieu AVILA <mathieu.avila@opencubetech.com>
To: xfs@oss.sgi.com
Subject: Re: extremely slow write performance plaintext
Date: Tue, 25 Jan 2011 10:48:35 +0100 [thread overview]
Message-ID: <4D3E9C73.6090508@opencubetech.com> (raw)
In-Reply-To: <201101250721.14716@zmi.at>
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Le 25/01/2011 07:21, Michael Monnerie a écrit :
> On Dienstag, 18. Januar 2011 Cory Coager wrote:
>> Also, I want to stress that I am only having performance issues with
>> one logical volume, the others seem fine.
> You're getting 40MB/s write speed and says that's fine? I get more
> performance from a single SATA desktop drive. Your setup seems to suck
> extremely somewhere.
>
> It already starts with your dd speed. I started it on a virtualized VM
> on an old, overloaded server and get:
>
> # dd if=/dev/zero of=test.dd bs=1k count=1M
> 1048576+0 Datensätze ein
> 1048576+0 Datensätze aus
> 1073741824 Bytes (1,1 GB) kopiert, 10,9992 s, 97,6 MB/s
>
I would say this is melted with cache hit, isn't it ? (although I agree
it depends on the server's memory dedicated to FS cache)
A real cache hit on a real server would give me at least 500 MB/s
(actually I get something around 1 GB/s)
When it starts to be disk-constrained, on a standard SATA disk, I get
from 75 MB/s to 140 MB/s depending on the position of the AG I hit.
--
*Mathieu Avila*
IT & Integration Engineer
mathieu.avila@opencubetech.com
OpenCube Technologies http://www.opencubetech.com
Parc Technologique du Canal, 9 avenue de l'Europe
31520 Ramonville St Agne - FRANCE
Tel. : +33 (0) 561 285 606 - Fax : +33 (0) 561 285 635
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next prev parent reply other threads:[~2011-01-25 9:46 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-13 21:22 extremely slow write performance plaintext Cory Coager
2011-01-13 22:35 ` Emmanuel Florac
2011-01-14 0:17 ` Cory Coager
2011-01-14 19:51 ` Stan Hoeppner
2011-01-14 20:48 ` Cory Coager
2011-01-14 22:02 ` Stan Hoeppner
2011-01-18 14:16 ` Cory Coager
2011-01-19 9:59 ` Stan Hoeppner
2011-01-25 14:22 ` Cory Coager
2011-01-25 6:21 ` Michael Monnerie
2011-01-25 9:48 ` Mathieu AVILA [this message]
2011-01-25 14:25 ` Cory Coager
2011-01-28 6:22 ` Michael Monnerie
2011-01-28 13:08 ` Cory Coager
2011-01-25 14:27 ` Cory Coager
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