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Re: extremely slow write performance plaintext

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Subject: Re: extremely slow write performance plaintext
From: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 25 Jan 2011 07:21:09 +0100
Cc: Cory Coager <ccoager@xxxxxxxxxxxxxxx>, Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
In-reply-to: <1779_1295360207_4D35A0CF_1779_747_1_4D35A0CF.9050503@xxxxxxxxxxxxxxx>
Organization: it-management http://it-management.at
References: <3205_1294953756_4D2F6D1C_3205_1943_1_4D2F6D1C.2060409@xxxxxxxxxxxxxxx> <4D30C7F3.3040105@xxxxxxxxxxxxxxxxx> <1779_1295360207_4D35A0CF_1779_747_1_4D35A0CF.9050503@xxxxxxxxxxxxxxx>
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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

This is a hardware RAID 6 with just 8x 10krpm WD SATA drives. Try to 
look into general I/O problems. Maybe you can try to boot from an actual 
linux CD with kernel >2.6.30 to see if that helps performance.

Maybe one or more disks in your array are dead and the controller is 
crying for replacement?

-- 
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Michael Monnerie, Ing. BSc

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