ZFS performance bottlenecks: CPU or RAM or anything else?

[Alex Tutubalin]

> If you're already planning for multiple simultaneous drive failures,
> "economical" isn't really a factor, is it? Those disks have to get
> replaced regardless of the redundancy scheme you assign to them. ;)

I do not plan failures, but there always a chance of bad drive model.  
I've survived 3-Tb Seagates without data loss. It was not possible in my 
case without RAID6 (hardware).

> Speaking strictly about performance, RAIDZ performance is pretty much
> fixed,

Anyway, my thread-starting question is different:

I see great performance difference on same pool connected to different 
CPU/ram combo.
I do not know what caused this difference: CPU speed, RAM bandwidth, or 
RAM latency.

May be someone in this list has benchmarked ZFS RAIDZ for performance 
and knows what is the bottleneck?


Alex Tutubalin