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
>>>         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
>>>         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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