Build Help - R720 16 bays

[CaraquetFlyer]

Hello,

We are looking to add FreeNAS(on dedicated hardware, no virtualization) as an iSCSI target in our 3 x Vmware ESXi 6.5 for storage of multiple Asterisk PBX VM's.

Main question: Which zpool and vdev configuration to use?

Here's details of our FreeNAS server and would welcome any input on our setup.

• Dell R720 16 bays
  • 2 x E5-2660 V2 cpu
  • 192GB ECC ram
  • LSI 9207-8i HBA card
  • 12 x SSD 300GB DC S3500 for zfs3
  • 3 x SSD 300GB DC S3700: 2 x ZIL in mirror and 1x L2ARC
  • 2 x innodisk satadom in mirror for freenas os
  • 1 x Broadcom 5720 quad port nic
  • 1 x 10Gb dual port for nic available
• Switch
  • 2 Cisco 3750x
    • PowerStack enable (automatic power supply failover)
    • LACP enable (failover configuration)

Any configuration input on how to setup our FreeNAS is again welcome.