From: Kun Li (likun@asiainfo.com)
Date: Fri Jan 03 2003 - 04:10:58 EST
Hi, fellows
Thanks to Brett Lymn, Ryan, Kevin Buterbaugh, Hichael Morton.
They suggested me to ignore the statistics for metadevices and
concentrate on the statistics for the physical disks. As long as
they are ok, then you are ok. The high wait times on idle
partitions is really just an artifact of how the kernel measures
the wait times. And also came the suggestion that download
and install SEtoolkit, run "virtual_adrian" and let it tell you the story.
thank you , everyone.
My original question is as follows:
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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