ZFS which uses SAN (ISCSI/FC/NVMEoe...) as VDEV

**Is it reasonable to use ISCSI/FC as a block device and use it as a vdev for ZFS?** Reasoning: There is only so much disks (even with external enclosures) that you can put in one host. We are looking into a solution where we would build a head unit (server acting as iSCSI initiator) and disk hosts (servers acting as iSCSI targets). Disk hosts would expose their disks (either each one individually or RAID-ed), head unit would connect over ethernet to those disk units over iSCSI and use those exported disks as VDEVs for a giant ZFS. Remember, Z in ZFS means Zettabyte! Meaningless if you cannot connect a zettabyte worth of disks somehow :)