Re: [suse-sles-e] Slow direct I/O performance SLES 10 SP1

From: Gordon Ross (G.Ross_at_ccw.gov.uk)
Date: Tue Aug 07 2007 - 09:50:54 CEST 

Message-Id: <46B8325C.AC0B.0006.3@ccw.gov.uk>
Date: Tue, 07 Aug 2007 08:50:54 +0100
From: "Gordon Ross" <G.Ross@ccw.gov.uk>
Subject: Re: [suse-sles-e] Slow direct I/O performance SLES 10 SP1

>>> On 07 August 2007 at 08:34, in message <1581267168@web.de>, Andreas
Mock
<Andreas.Mock@web.de> wrote:

>> -----Ursprüngliche Nachricht-----
>> Von: "Gordon Ross" <G.Ross@ccw.gov.uk>
>> Gesendet: 07.08.07 09:20:15
>> An: <suse-sles-e@suse.com>
>> Betreff: Re: [suse-sles-e] Slow direct I/O performance SLES 10 SP1
>
> Hi Gordon,
>
> you misunderstood me. You should increase the number of blocks
transfered
> (count=)
> not the block size. I want to see if you have a write cache on the
disks.

Zzzzz.... More Caffeine......

DL385G2: (10SP1)

ns@hq-hls3:~> dd oflag=direct if=/dev/zero of=data.out bs=4k
count=100000
100000+0 records in
100000+0 records out
409600000 bytes (410 MB) copied, 8.10884 seconds, 50.5 MB/s

DL385G1 (both 10 & 10SP1)

ns@hq-hls1:~> dd oflag=direct if=/dev/zero of=data.out bs=4k
count=100000
100000+0 records in
100000+0 records out
409600000 bytes (410 MB) copied, 412.793 seconds, 992 kB/s

GTG 

-- 
— 
Gordon Ross,
Network Manager/Rheolwr Rhydwaith
Countryside Council for Wales/Cyngor Cefn Gwlad Cymru
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