Re: CLB.  It's enabled by default.  Requires special access to disable it. Re: IQN.  Yes, the IQN of the iSCSI initiator on each ESXi node.  Yes, once complete and you are satisfied that all the VMs are migrated, shutdown the M1000E nodes, and remove that IQN from the volume ACL.  It's going to take some time to evacuate the PS4000 so again, these can be done in parallel.  Or start the PS4000 evacuation at night, will probably be done by the next morning.  As a best practice when removing a member, move it to a temp pool then delete it from the group.    
Hello - I am looking for some process input\ direction into migrating from a PowerEdge M1000e to a Dell FX2. Our PE 1000e has 3 M610s and 1 M520 blades with VMware 5.0 on each. We are also moving from a PS4000 to a PS6100x SAN. I am clear on the SAN migration part (ie. Upgrading the Firmware'  etc.) but I am unsure as to how to migrate from 1000e to the FX2? Once the SAN is migrated from the 4000 to the 6100 would we simply load VMware 5.5 on each of the FX2' 4 Blades and connect the FX2 to the 6100x using iSCSI?  Any help would be appreciated. Thanks,  
PowerEdge M1000e and Dell FX2