Hi Ed,  VPLEX back-end leverages ALUA for path management when talking to VNX arrays (and other supported arrays advertising ALUA).   For ideal performance, you most definitely want to balance the LUN assignments across both VNX SPs.  So long as you have the proper ALUA settings configured on the VNX for VPLEX, the trespassing when performed on the VNX should be seamless.  The VPLEX best practices guide on support.emc.com ([URL]… ) states that:  When provisioning storage to VPLEX, ensure that mode 4 (ALUA) or mode 1 set during VPLEX initiator registration prior to device presentation. Don’t try to change it after devices are already presented.  So long as you have that set properly on the VNX, you should be fine.  Gary
Very quick question, is there any reason why all the luns for VPLEX would be assigned to a single SP? I have a customer which has this and I would have thought having them distributed between SPs would be preferable.  *Edit* I'm 99% sure that they do need to be distributed evenly, is there any issue with moving them via Unisphere?   Thanks,  Ed
VPLEX lun SP distribution