FreBSD 9.1 and ZFS v28 performances

[Davide D'Amico]

Il 18.03.2013 20:28 Steven Hartland ha scritto:
> ----- 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
> 

Ok, I'll give it a try (never used, I thought it has been dismissed), 
and I'll let you know.

>> 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   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?
This is UFS on SSD, that has the same behaviour than UFS on RAID10 HW 
on SAS drives.

d.