Re: ZFS, Dell PE2950

[Ivan Voras]

Benjeman Meekhof wrote:

Sure, here is an example iozone output when I tested UFS2. Same hardware config as with ZFS test.

#gstripe label -v -s 128k test /dev/mfid0 /dev/mfid2
#newfs -U -b 65536 /dev/stripe/test


"Throughput report Y-axis is type of test X-axis is number of processes"
"Record size = 512 Kbytes "
"Output is in Kbytes/sec"

" Read " 505978.28 546837.12 565786.34 310994.23 309813.64 329930.91 351162.15 376940.64 408561.11 432157.69 452106.75 470176.39

" Re-read " 523917.72 581796.50 592393.28 314724.70 308485.12 327409.40 350913.96 381370.12 408105.25 434168.93 458742.49 475407.44

This is hard to compare to what you've posted before, but if it means that with ZFS you get 136 MB/s and with UFS 300-593 MB/s, something is wrong. 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?

-Ben

Ivan Voras wrote:

Benjeman J. Meekhof wrote:

Hi,

I posted earlier about some results with this same system using UFS2.
Now trying to test ZFS.  This is a Dell PE2950 with two Perc6
controllers and 4 md1000 disk shelves with 750GB drives.  16GB RAM, dual
quad core Xeon. I recompiled our kernel to use the ULE scheduler instead
of default.

I could not get through an entire run of iozone without a system
reboot/crash.  ZFS is clearly labeled experimental, of course.

It seems to die for sure around 10 processes, sometimes less (this is
the end of my output from iozone):

 Children see throughput for 10 readers          =  135931.72 KB/sec

        Min xfer                                        = 31586816.00 KB

Parent sees throughput for 10 readers = 135927.24 KB/sec Min throughput per process = 13351.26 KB/sec Max throughput per process = 14172.05 KB/sec Avg throughput per process = 13593.17 KB/sec

Can you tell us how does this compare to UFS2 results you posted
previously? (since you used dd for UFS2 and now iozone for ZFS; what are
your conclusions?)

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