Which OS can work as a fiber-channel target

Basicly you need to make FC availible before the volume can be detected, also Solaris usualy use qlc driver for SAN, and check the QLA2340 firmware with scli utility. Then reboot the server with a "reconfiguration", the SAN connection show be seen at this point by command:

# cfgadm -al

That's normal for ZFS. What's happening is it's coalescing the writes in memory and then committing them to disk at the same time. This a great wiki about what it's doing and how you can tune it:

http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide