You should really be using Host Sets and Virtual Volume Sets. Once you do that, you don't have to export new volumes, you just add them to a VVS that has already been exported to a Host Set.
For example: You have 3 ESX hosts -- ESX1, 2, and 3. Create a host set ESXCluster1 with those 3 members. For storage, you have VV1, VV2, and VV3. Add those to a new Virtual Volume Set VVS_ESXCluster1. Export VVS_ESXCluster1 to ESXCluster1, choosing a starting LUN# that makes sense. If a while down the road you need more storage, create VV4 and add it to VVS_ESXCluster1. It'll automatically export to all hosts as the next sequential LUN#. If you expand the cluster itself, just add ESX4 to host set ESXCluster1, and it'll see all the same storage as the other members.
Something to keep in mind: LUN #s need to be sequential with no gaps, so if you already have a LUN 5, exporting the VVS as LUN 3 would only give you the ability to export 2 LUNs (3 & 4).
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