i've seen where "server_devconfig ALL -c -s -a" does not discover devices equally, so try running this command on individual bases  server_devconfig server_3 -create -scsi -all
I was provisioning some storage to Celerra using /nas/sbin/setup_clariion -all. All working well, but two out of 30ish disks only showing up as being accessible from server_2, but not server_3. This means I cannot create storage pool using disk with only one accessible server. It is NS-20 integrated system and seems to be working well. There is output of nas_disk -list. 
Some Clariion disks only visible by server_2