ZFS, Dell PE2950
ivoras at freebsd.org
Wed Apr 16 20:21:16 UTC 2008
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
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?
> Ivan Voras wrote:
>> Benjeman J. Meekhof wrote:
>>> 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
>>> Parent sees throughput for 10 readers = 135927.24
>>> Min throughput per process = 13351.26
>>> Max throughput per process = 14172.05
>>> Avg throughput per process = 13593.17
>>> Min xfer = 31586816.00 KB
>> 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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