Increase I/O performance in ZFS Storage

Hi,

I have two ZFS Storage ZS3-2 in cluster, the información in this nodes are:

Processors: 2x2.10GHz Intel(r) Xeon(r) CPU E5-2658 0 @ 2.10GHz AES-NI

Memory: 256 GB

Data: -

Cache: -

Log: -

Disk Shelf:

     20 disk of 4 TB RPM 7200

     20 disk of 900 GB RPM 10000

Pool1: RAIDZ2 (20 X 4TB)

Pool2: MIRROR (20 X 900GB)

The distribution of Pools are:

Pool1:

     Cache device usage: All data and metadata

     Synchronous write bias: Latency

     Project1:

     20 Luns X 200GB --- > +FRA

     Project2:

     1 Lun of 15 TB --- > Application

     Project3:

     1 Lun of 2 TB --- > Aplication1

     ...

Pool2:

     Project1:

     Cache device usage: All data and metadata

     Synchronous write bias: Latency