Can i pause VM's while power-cycling iscsi storage array
I would recommend powering everything down when you power cycle the array. That way you are completely sure that everything is flushed correctly.
The additional outage time sucks, but when it comes to downing the storage array I don't screw around with shortcuts.
Pause means migrating the VM into a file, and then reloading it from that file. You need to make sure the file is on the local storage and not on the SAN. And before pausing, I'd also try and quiesce the VM, the the application you are using allows it.