[suse-sles-e] Suggestions for improving disc performance

From: Gordon Ross (G.Ross_at_ccw.gov.uk)
Date: Thu Feb 22 2007 - 18:13:37 CET

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Message-Id: <45DDCF40.AC0B.0006.3@ccw.gov.uk>
Date: Thu, 22 Feb 2007 17:13:37 +0000
From: "Gordon Ross" <G.Ross@ccw.gov.uk>
Subject: [suse-sles-e] Suggestions for improving disc performance

We have an HP DL385G1 with Opteron 250 CPU, 10GB RAM with SLES10, 64-bit
version installed.

When we connect it to a bland external disc array via an LSIU320 host
adapter, we achieve approx 70MB/s read performance. The array
manufacturer claims the array can do 328MB/s

When I connect the server to an EMC CX500 via QLogic 2340 HBAs, and
read from a fibre-channel RAID 5 LUN, I get 140MB/s throughput.

I did the tests by doing a simple "dd if=file of=/dev/null bs=65536"

Both of these throughput figures I believe are low.

Can anyone suggest as to how I could improve on these figure ? I would
like to get somewhere nearer 200MB/s sequential read. (I am NOT
interested in random I/O performance)

Thanks,

GTG

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