XFS/istgt backed 8TB xfs filesystem configuration?

[John]

Hi Folks,

   I've been asked to export an 8TB volume (via istgt) and was
curious if anyone has any experience with optimal xfs configurations
in this area.

   Typically, volumes for linux are created similar to:

zfs create -b 32768 -V $lunsize $physname

   On a dual 10g data backbone network, we use mpio with 2 channels
per net:

[PortalGroup4]
   Comment "Two networks - Two ports"
   Portal DA1 10.59.10.10:5000
   Portal DA2 10.60.10.10:5000
   Portal DA3 10.59.10.10:5001
   Portal DA4 10.60.10.10:5001
   Comment "END: PortalGroup4"

   which typically seems to give the best performance. The luns are
being brought together on the linux side (RHEL 6.1) with multipath.

   I've google'd around a bit and don't see much about zfs filesystems
on top of iscsi exported zfs volumes :-)

   Anyone have any experience in this area? Suggestions? I'm told
the data patterns will be mostly database reads, minimal writes.

Thanks,
John