Lustre discuss - Feb 2010 - appropriate parameters for obdfilter-survey

Hello lustre list,

I''d like to use obdfilter-survey to figure out our performance
subsystem benchmark.  I have this setup on a development cluster (1.8.2) that
nobody has access to.

Machine specs are as follows:

Dual Xeon 5550
36G ram
Dual connections to FC san with a single test lun of 300G * 15k sas drives
"chunk"/"element" size is 64k.

I am formatting as follows:

mkfs.lustre --reformat --ost --fsname=test01 --mkfsoptions=''-E
stride=16,stripe-width=128'' --mgsnode=10.1.5.202 at tcp0 /dev/dm-2

Because I have so much ram and I want to test actual disk speed, I am using the
following obdfiter-survey command line:

size=40000 rszlo=4 rszhi=1024 nobjlo=1 nobjhi=512 thrlo=1 thrhi=16 sh
./obdfilter-survey

Our average file size is about 800kb, and we only have 10-15 clients at a time. 
I am doing this from the oss and it picks up "case=disk" which is
fine.  We do have many many small files (4k-16k''ish) and a few very
large files.  I''m more interested in optimizing for small file
iops/throughput than large files since we are constrained to gigabit Ethernet on
the networking side.

Does this look like a reasonable obdfilter-survey test for our use case?

Thanks,

Robert

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