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List: ext3-users
Subject: =?iso-8859-1?q?RE=A0=3A_Poor_ext3_performance_on_RAID_array?=
From: "GARDAIS Ionel" <Ionel.Gardais () tech-advantage ! com>
Date: 2007-08-08 20:31:40
Message-ID: F0A97025ACD0234A928AF05B74060E1807CB93 () MAILSERV ! beicip ! fr
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Hi Rene,
You should try to add the "-E stride=X" option to the mkfs command line.
Where X is expalined in the man page.
This will basically map ext3 "blocks" on the RAID stripe size.
Ionel
-------- Message d'origine--------
De: ext3-users-bounces@redhat.com de la part de Rene Salmon
Date: mer. 08/08/2007 22:21
À: ext3-users@redhat.com
Objet : Poor ext3 performance on RAID array
Hi list,
I am having some strange performance issues with ext3 and I am hoping to
get some advice/hints on how to make this better. First some background
on the setup.
We have a RAID 5 array 10+1+1 with one LUN. That is 10 SATA drives one
parity drive and one dedicated spare. The LUN is about 6.5TB.
Using a 2Gbit/sec fiber channel card I can do some dd writes to the raw
device and get speeds close to 200Mbytes/sec which is more or less the
max the card can do.
Next I create an xfs file system on the LUN and do a dd to xfs and get
speeds close to 150Mbytes/sec.
I want to use ext3 not xfs so next I put ext3 on the lun. Now when I do
the dd to the ext3 lun I get 25-50Mbytes/sec depending on whether I have
the Raid controller cache turned on or off. Getting 50MBytes/sec with
the raid controller cache turned off.
I know that ext3 should perform better so I must be doing something
wrong. Here is my mkfs.ext3
mkfs.ext3 -b4096 -Tlagefile4 /dev/dm-0
Thanks in advanced for any help on this.
Rene
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<TITLE>RE : Poor ext3 performance on RAID array</TITLE>
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<P><FONT SIZE=2>Hi Rene,<BR>
<BR>
You should try to add the "-E stride=X" option to the mkfs command line.<BR>
Where X is expalined in the man page.<BR>
<BR>
This will basically map ext3 "blocks" on the RAID stripe size.<BR>
<BR>
Ionel<BR>
<BR>
<BR>
-------- Message d'origine--------<BR>
De: ext3-users-bounces@redhat.com de la part de Rene Salmon<BR>
Date: mer. 08/08/2007 22:21<BR>
À: ext3-users@redhat.com<BR>
Objet : Poor ext3 performance on RAID array<BR>
<BR>
Hi list,<BR>
<BR>
<BR>
I am having some strange performance issues with ext3 and I am hoping to<BR>
get some advice/hints on how to make this better. First some background<BR>
on the setup.<BR>
<BR>
We have a RAID 5 array 10+1+1 with one LUN. That is 10 SATA drives one<BR>
parity drive and one dedicated spare. The LUN is about 6.5TB.<BR>
<BR>
Using a 2Gbit/sec fiber channel card I can do some dd writes to the raw<BR>
device and get speeds close to 200Mbytes/sec which is more or less the<BR>
max the card can do.<BR>
<BR>
Next I create an xfs file system on the LUN and do a dd to xfs and get<BR>
speeds close to 150Mbytes/sec.<BR>
<BR>
I want to use ext3 not xfs so next I put ext3 on the lun. Now when I do<BR>
the dd to the ext3 lun I get 25-50Mbytes/sec depending on whether I have<BR>
the Raid controller cache turned on or off. Getting 50MBytes/sec with<BR>
the raid controller cache turned off.<BR>
<BR>
I know that ext3 should perform better so I must be doing something<BR>
wrong. Here is my mkfs.ext3<BR>
<BR>
mkfs.ext3 -b4096 -Tlagefile4 /dev/dm-0<BR>
<BR>
Thanks in advanced for any help on this.<BR>
<BR>
Rene<BR>
<BR>
</FONT>
</P>
</BODY>
</HTML>
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