I have a VNX 5700 with 4 ports per SP and a 4 engine VPLEX. The code level we are running (won't be updated at this time) on the VNX has a limit of 1024 LUNs per storage group so we need 2 storage groups. Would it be recommended to share the VNX ports across storage groups like configuration A or isolate them like configuration B below? What is best practice?

configuration A:

vnx storage group a

vplex engine X dir A BE fc00 -> vnx sp a0/a2/b0/b2 (Fabric A - Zone A)

vplex engine X dir A BE fc01 -> vnx sp a1/a3/b1/b3 (Fabric B - Zone B)

vplex engine X dir B BE fc00 -> vnx sp a0/a2/b0/b2 (Fabric A - Zone C)

vplex engine X dir B BE fc01 -> vnx sp a1/a3/b1/b3 (Fabric B - Zone D)

same for all 4 engines

vnx storage group b

vplex engine X dir A BE fc02 -> vnx sp a0/a2/b0/b2 (Fabric A - Zone E)

vplex engine X dir A BE fc03 -> vnx sp a1/a3/b1/b3 (Fabric B - Zone F)

vplex engine X dir B BE fc02 -> vnx sp a0/a2/b0/b2 (Fabric A - Zone G)

vplex engine X dir B BE fc03 -> vnx sp a1/a3/b1/b3 (Fabric B - Zone H)

same for all 4 engines

configuration B:

vnx storage group a

vplex engine X dir A BE fc00 -> vnx sp a0/b0 (Fabric A - Zone A)

vplex engine X dir A BE fc01 -> vnx sp a1/b1 (Fabric B - Zone B)

vplex engine X dir B BE fc00 -> vnx sp a0/b0 (Fabric A - Zone C)

vplex engine X dir B BE fc01 -> vnx sp a1/b1 (Fabric B - Zone D)

same for all 4 engines

vnx storage group b

vplex engine X dir A BE fc02 -> vnx sp a2/b2 (Fabric A - Zone E)

vplex engine X dir A BE fc03 -> vnx sp a3/b3 (Fabric B - Zone F)

vplex engine X dir B BE fc02 -> vnx sp a2/b2 (Fabric A - Zone G)

vplex engine X dir B BE fc03 -> vnx sp a3/b3 (Fabric B - Zone H)

same for all 4 engines