From: Stuart Abramson (stuarta46@yahoo.com)
Date: Mon May 23 2005 - 08:30:15 EDT
I wanted to run a quick disk performance test, in response to questions that have come up.
I wrote this little script:
TIME=$(timex dd if=$Disk of=/dev/null count=10000 2>&1 \
| grep real | awk '{print $2}' )
print -n ${DISKA[$I]} "\t" $TIME "\t"
echo 5.12 $TIME | awk '{printf "%.2f\n", $1 / $2 }'
The idea is that I read raw 10000 blocks of block size 512 bytes = 5 MBs and then caclulate the MBytes/sec.
I'm not conducting a rigorous scientific test. I just want to have something to take to the performance group (who will make recommendations back to the UNIX and Storage teams).
Questions:
1. Does this sound reasonable?
2. Is a raw read off the rdsk acceptable for performance measurements? I compared it to a dd if=/dev/vgXX/lvolNN and it came out in the same range.
3. I'm getting values in the range of 2.8 MBytes/sec. Does that sound reasonable?
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