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тАО05-23-2005 01:27 AM
тАО05-23-2005 01:27 AM
quick disk performance test ?
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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тАО05-23-2005 01:34 AM
тАО05-23-2005 01:34 AM
Re: quick disk performance test ?
What kind of disk drive?
Performance will be based upon speed of rotation (RPM's), IO interface speed, CPU availability, disk caching, ....
live free or die
harry d brown jr
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тАО05-23-2005 01:36 AM
тАО05-23-2005 01:36 AM
Re: quick disk performance test ?
- If you are testing a disk on an array (XP, EVA, EMC etc) then your results will be greatly skewed due to cache.
- You should perform the tests when the system is idle - random access to the disk you are testing again will skew the results.
Your 2.8MB/sec doesn't sound very fast, but it depends again on your server. On an rp54xx I'm getting about 8MB/sec on the internal 36Gb disks, but if you're testing an old A class for example those numbers may be more indicative.
You may be better using a combination of Glance/Measureware to get performance information with "real" data.
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тАО05-23-2005 01:50 AM
тАО05-23-2005 01:50 AM
Re: quick disk performance test ?
dd if=/dev/vgname/rlvolname of=/dev/null bs=1024k count=nnn
where nnnn should be sufficiently large to overcome the effect of cache.
Note, for LVM.. your RAW device is the lvolname prefixed with "r".
You may also do the same command on raw physical disks.. i.e. /dev/rdsk/cXtYdZ
I would prefer iozone though.
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тАО05-23-2005 04:32 AM
тАО05-23-2005 04:32 AM
Re: quick disk performance test ?
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тАО05-24-2005 12:03 AM
тАО05-24-2005 12:03 AM
Re: quick disk performance test ?
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тАО05-24-2005 12:06 AM
тАО05-24-2005 12:06 AM
Re: quick disk performance test ?
Please have a look my attachment
good Luck,
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тАО05-28-2005 09:09 AM
тАО05-28-2005 09:09 AM
Re: quick disk performance test ?
I tried various blocksizes from 512 to 32768 and I/O rate increases from 2 MB/s to 45 MB/s (depending on server, disk, etc.). Block Size of 8192 gives me about 20-30 MB/s on hpux L3000s connected to EMC Symmetrix DMX 2000 with 2 Gb/s FAs:
((BS=8192))
((Count=5120000/BS))
TIME=$(timex dd if=$Disk of=/dev/null count=$Count bs=$BS 2>&1 \
| grep real | awk '{print $2}' )
MBpS=$( FDIV 5.12 $TIME )
printf "%5s %6s %8s %6s %6s %6s %6s \n" \
$LUN $ARRAY $DISK $SP $BS $TIME $MBpS
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тАО05-28-2005 10:10 PM
тАО05-28-2005 10:10 PM
Re: quick disk performance test ?
http://www.iozone.org
But HP also have a bunch more listed here:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50460#N1053E
HTH
Duncan
I am an HPE Employee
