From: Kun Li (likun@asiainfo.com)
Date: Tue Dec 31 2002 - 05:30:20 EST
Hi, all
I've got a SUN E450 running Solaris 7.
We used SUN Disksuite to combine two ssd disks to form a mirrored md disk.
The two ssd disks are : ssd0 ssd1
and the md disk divided into four partitions: md0 md4 md5 md6.
then the following is the output of sar :
device %busy avque r+w/s blks/s avwait avserv
10:10:01 md0 0 0.0 0 1 100.6 77.2
md4 1 0.0 0 2 191.5 59.0
md5 97 6.1 164 2635 2.2 35.2
md6 1 0.0 0 1 265.0 151.1
ssd0 97 4.9 165 2641 0.0 29.4
ssd1 96 4.4 165 2641 0.0 26.4
from the output , we noticed the response times of md0 - md4 are very high ,
up to
400ms (avwait + avserv). but from ssd0/ssd1's performance , it's below
30ms.
and also, most of the data is visiting md5, which with a not bad
performance, say 35.2ms.
The problem is , how to evaluate the i/o performance of this server ? is it
good or bad ?
any input/comment is appreciated.
sincerely
likun
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