Anyone using freebsd ZFS for large storage servers?

[Wojciech Puchar]

> On Fri, Jun 1, 2012 at 1:23 AM, Albert Shih <Albert.Shih at obspm.fr> wrote:
>> I've Dell R610 + 48 Go Ram, 2x 6 core + 4 * MD1200 (36*3T + 12*2T)
>>
>> [root at filer ~]# zpool list
>> NAME     SIZE  ALLOC   FREE    CAP  DEDUP  HEALTH  ALTROOT
>> filer    119T  35,4T  83,9T    29%  1.00x  ONLINE  -
>> [root at filer ~]#
>>
>> Work very fine (I can't say I've long experience because the server is up
>> since just 4 months).
>>
>> The ZFS is very good, easy to manage, very fast.

i dare not to agree about "very fast". very fast is relative term. how did 
you configured your storage?

trivial test:

make 10 100GB files (so none fits in RAM) by

for x in 0 1 2 3 4 5 6 7 8 9;do ( dd if=/dev/zero of=testfile$x bs=1m 
count=100k &) ;done

measure time needed for it to finish (all dd processes exist)

then install /usr/ports/benchmark/randomio and do some tests of random 
reads on that files.

and final test - 10 randomio in parallel with 10 threads each, one per 
every file.

then sum up results (IOPS) and divide by amount of disks you have.

then decide if is it fast or slow :)

>> They're two default IMHO :
>>
>>        Eat lot of Ram

can be controlled by settings in loader.conf.