FreBSD 9.1 and ZFS v28 performances

[Steven Hartland]

----- Original Message ----- 
From: "Davide D'Amico" <davide.damico at contactlab.com>
>> How does ZFS compare if you do it on 1 SSD as per your second
>> UFS test? As I'm wondering the mfi cache is kicking in?
> 
> Well, it was a test :)
> 
> The MFI cache is enabled because I am using mfid* as jbod (mfiutil 
> create jbod mfid3 mfid4 mfid5 mfid6):

Don't use mfiutil to do this it doesnt work it creates mirrors.

Use MegaCli instead to create real jbods e.g.
MegaCli -AdpSetProp -EnableJBOD -1 -aALL 

>> 
>> While running the tests what sort of thing are you
>> seeing from gstat, any disks maxing? If so primarily
>> read or write?
> Here the r/w pattern using zpool iostat 2:
> 
> DATA        52.2G  1.03T    102      0  1.60M      0
> DATA        52.2G  1.03T      7    105   128K   674K
...
> DATA        52.2G  1.03T      0     97      0   402K
> 
> And the result from sysbench:
> General statistics:
>     total time:                          82.9567s
>     total number of events:              1
>     total time taken by event execution: 82.9545s

Thats hardly doing any disk access at all, so odd it would be doubling
your benchmark time.

> Using a SSD:
> # iostat mfid2 -x 2
>        tty           mfid2             cpu
>  tin  tout  KB/t tps  MB/s  us ni sy in id
>    0    32 125.21  31  3.84   0  0  0  0 99
>    0   170  0.00   0  0.00   1  0  0  0 99
>    0    22  0.00   0  0.00   3  0  2  0 96
>    0    22  0.00   0  0.00   3  0  1  0 96
>    0    22 32.00   2  0.08   3  0  1  0 96
>    0    22 32.00   0  0.02   3  0  1  0 96
>    0    22  4.00   0  0.00   3  0  1  0 96
>    0    22  0.00   0  0.00   3  0  1  0 96
>    0    22  0.00   0  0.00   3  0  2  0 96
>    0    22  0.00   0  0.00   3  0  1  0 96
>    0    22  0.00   0  0.00   3  0  1  0 96
>    0    22  0.00   0  0.00   3  0  1  0 96
>    0    22  0.00   0  0.00   3  0  1  0 96
>    0    22  0.00   0  0.00   3  0  1  0 96
>    0    22  0.00   0  0.00   3  0  1  0 96
>    0    22  0.00   0  0.00   3  0  2  0 96
>    0    22 44.80  67  2.95   3  0  1  0 96
>    0    22 87.58   9  0.81   3  0  2  0 96
>    0    22 32.00   3  0.09   2  0  2  0 96
>    0   585  0.00   0  0.00   3  0  1  0 96
>    0    22  4.00   0  0.00   0  0  0  0 100
> 
> And the result from sysbench:
> General statistics:
>     total time:                          36.1146s
>     total number of events:              1
>     total time taken by event execution: 36.1123s
> 
> That are the same results using SAS disks.

So this is ZFS on the SSD, resulting the same benchmark results as UFS?

    Regards
    Steve

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