ZFS, Dell PE2950

Benjeman J. Meekhof bmeekhof at umich.edu
Wed Apr 16 21:35:59 UTC 2008

I have some old dd numbers from when I was experimenting to find a 
UFS/gstripe combination that wasn't horrifyingly slow to read.  I was 
not then adjusting filesystem blocksize, and not until moving UFS2 bs to 
the maximum did initial results seem worth resuming iozone tests.   Raid 
HW stripe-width is 128k. FWIW.

# using 4k stripe, same as above
#gstripe label -v -s 4k test /dev/mfid0 /dev/mfid2
#newfs -U /dev/stripe/test

#time dd if=/dev/zero of=/test/deletafile bs=1M count=10240
#time dd if=/test/deletafile of=/dev/null bs=1M count=10240

#write: 26.5s 403665800 bps
#read: 157s 68343843 bps


Ivan Voras wrote:
> Ivan Voras wrote:
>> Per my discussion with Scott Long Can you repeat the test for UFS, but 
>> create gstripe with a really small stripe size, like 4 KB?
> Actually, no need to do that - it looks like iozone is doing quite 
> random IO ops so it won't help you.

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