From: Holger.VanKoll@SWISSCOM.COM
Date: Wed Nov 13 2002 - 06:03:14 EST
uuuhhh.... quite a bit more. did you change any default-values?
could you be so nice to post
lsattr -El fcs0
lsattr -El fscsi0
lsattr -El one_of_your_discs
did you measure this 70mb/s with my script or in another way?
thank you very much!
-----Original Message-----
From: Willeat, Todd [mailto:TWilleat@MHP.SMHS.COM]
Sent: Tuesday, November 12, 2002 11:52 PM
To: aix-l@Princeton.EDU
Subject: Re: performance of san-disk
I've been able to get >70MB/s between a B80 (w/2 CPUs and 2
6228s) and a HDS 9200.
-----Original Message-----
From: Holger.VanKoll@SWISSCOM.COM
[mailto:Holger.VanKoll@SWISSCOM.COM]
Sent: Tuesday, November 12, 2002 3:05 PM
To: aix-l@Princeton.EDU
Subject: performance of san-disk
Hello,
I got a p670 connected to HDS (Hitachi; 9900) Storage
with 2 FC-adapter.
No matter how much disks I access concurrently, I get
34mbyte/sec maximum.
All 4 CPU are 0% idle when measuring, but depending on
the # disks they spend more time in kernel than in wait.
# disks accessed kernel wait disk-busy
(topas) transfer Mbyte/sec
10-20 8 90 50-70%
25
30 40 60 40-60%
33
40 55 45 60-80%
33
50 70 30 40-60%
34
60 78 22 35-50%
34
This looks like my CPU-power is the bottleneck, correct?
As I get 184 Mbyte/sec with the 4 internal disks and 60%
kernel / 40% wait that looks to me as if the fibre-channel driver
(kernel-time) uses all my cpu. Is this correct?
If someone likes to do some measurement to have numbers
to compare, here is the script I used:
#!/bin/sh
#dlmfdrv4 - 61
count=2000
bsk=256k
dev=dlmfdrv
#dev=hdisk
start=4
end=54
i=$start
until false
do
dd </dev/$dev$i >/dev/null bs=$bsk count=$count
2>/dev/null &
[ $i = $end ] && break
let i=i+1
done
I would appreciate any other "benchmark"-results,
especially latest ssa-technology and non hds (f.e. ibm) storage servers.
Regards,
Holger
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