Hi, NPIV is just to use multiple WWNs on one switch port.  see in "[URL]" page 1 -> Virtual SCSI targets per virtual machine 60  So you got out of vmware`s max scsi devices per VM.  I would set up a second server for and then install just SYM ans SDM agent to this and monitor half of your arrays by this vm.
I need to configure about 100+ gatekeepers for one of our ECC servers which is a VM guest and which we use to monitor synchronous replication and other status type things so it needs to see about 12 arrays.  The guest is running Windows on VSPhere 4.0.  I have configured NPIV and the virtual WWNs show up on the fabric and in the login lists for the symmetrix arrays but I can't add any more devices to the VM guest.  The gatekeepers show up on the ESX storage configuration already so no problem there.  According to the procedures I have found, I have to edit settings for the VM and add each device as a physical RDM, which I have done.  But once I reached 60 devices I can't add any more.  I found a VMWare document which does list SCSI devices with a maximum of 60 (15 per SCSI controller, max 4 SCSI controllers per guest) but I thought since I was using NPIV I could add more than that.  I would appreciate any help here, thanks.
NPIV for virtual ECC server