From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id p0P9kJ31235027 for ; Tue, 25 Jan 2011 03:46:20 -0600 Received: from opencube.bzctoons.net (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 6AC9F8AD544 for ; Tue, 25 Jan 2011 01:48:41 -0800 (PST) Received: from opencube.bzctoons.net (opencube-2.bzctoons.net [88.191.104.187]) by cuda.sgi.com with ESMTP id R3A2GZabBvcQvO9h for ; Tue, 25 Jan 2011 01:48:41 -0800 (PST) Received: from localhost (opencube.bzctoons.net.local [127.0.0.1]) by opencube.bzctoons.net (Postfix) with ESMTP id AE83490AD3 for ; Tue, 25 Jan 2011 10:48:40 +0100 (CET) Received: from opencube.bzctoons.net ([127.0.0.1]) by localhost (opencube.bzctoons.net [127.0.0.1]) (amavisd-maia, port 10024) with ESMTP id 08476-08 for ; Tue, 25 Jan 2011 10:48:39 +0100 (CET) Received: from [192.168.16.148] (opencube03.pck.nerim.net [62.212.120.41]) (Authenticated sender: mathieu.avila@opencubetech.com) by opencube.bzctoons.net (Postfix) with ESMTPA id E10B390AC5 for ; Tue, 25 Jan 2011 10:48:37 +0100 (CET) Message-ID: <4D3E9C73.6090508@opencubetech.com> Date: Tue, 25 Jan 2011 10:48:35 +0100 From: Mathieu AVILA MIME-Version: 1.0 Subject: Re: extremely slow write performance plaintext References: <3205_1294953756_4D2F6D1C_3205_1943_1_4D2F6D1C.2060409@davisvision.com> <4D30C7F3.3040105@hardwarefreak.com> <1779_1295360207_4D35A0CF_1779_747_1_4D35A0CF.9050503@davisvision.com> <201101250721.14716@zmi.at> In-Reply-To: <201101250721.14716@zmi.at> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============4388975937162609888==" Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com This is a multi-part message in MIME format. --===============4388975937162609888== Content-Type: multipart/alternative; boundary="------------040809080702070805000202" This is a multi-part message in MIME format. --------------040809080702070805000202 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit 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 --------------040809080702070805000202 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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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