Multi node storage, ZFS

[Miroslav Lachman]

Michal wrote:
> On 24/03/2010 17:14, Freddie Cash wrote:
>
>>
>> Yes, that would be helpful (mirrored slogs, until we get slog removal
>> support).
>>
>> As would an L2ARC (cache) device in the head node.
>>
>> As well as lots and lots and lots of RAM.
>>
>> And as fast of ethernet NICs as you can get between the head node and the
>> storage nodes.
>>
>> And, and, and, and ... :)
>>
>
> As far as I know more RAM is more important the fast CPU, so RAM is the
> order of the day, and I guess it depends what you think fast CPU is, but
> I wasn't planning on a duel CPU or anything top of the range. I have
> some duel core's knocking around...

Any modern multicore CPU will be fine. And more RAM you have, the larger 
ARC / prefetch will be used (more read speed you will gain)

> Michael, I sort of understand what you are talking about with ZIL, but
> not completely, so thanks for the pointers, there are clearly things I
> have not thought about.

This links can be useful to you

ZFS L2ARC
http://blogs.sun.com/brendan/entry/test

ZFS Evil Tuning Guide
http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Disabling_the_ZIL_.28Don.27t.29

ZFS ZIL + L2ARC SSD Setup
http://www.mail-archive.com/zfs-discuss@opensolaris.org/msg34674.html

Miroslav Lachman