ok, in that case i would be extremely careful because some of these changes may require reboot/downtime. If you are not comfortable with these changes i would contact EMC support.
Hi all  We got storage VNX 5300 and are trying to connect it with switches to some servers  [IMAGE] Servers are HP Integrity rx 6600, with FC1143 4 GB HBA, and with RedHat Enterprise 4 on them. Third one is HP ProLiant DL360 G5 same FC card and OS.  FC switches are HP StorageWorks 4/8 Base SAN Switch (no zones created on them) - not connected to network, only with FC cables to servers and storage.  Two servers are connected to both switches (let we call them s1 and s2), third one isn't. I connected fc switch 1 to storage unit and in Host Managment -> Connectivity status I got new connections. I chose Initiator type to be Clariion Open and Failover Mode to be active-active failovermode 4. Of course before setting thing on servers I connected and second switch to storage unit and chose same settings. Then we switched our attention to servers. We started with third one (one that have only one connection to FC SW1 - it's a backup  server). And it saw all LUN's that we publish to it. We went awwww awsome. Then we started to work with second one. We did hp_rescan -a and we got LUNZ and we wen't whats this. We tried server 1 and we got the same. After seweral hours of trying to see LUNs on those servers, I chose to unpublish LUNs for FC SW2 (in Storage groups I disconnected host switch 2). We went back to servers1 and 2 and we got our LUNs there. Yeeeey (it was 3 am, copying of DB to new storage took ruffly 5 h). Now we have system that is actually using only one FC switch that is connected with only one connection to storage unit. Second FC switch is connected to storage butt, as I sad, I disconnected it from storage group. My question is: What we need to do, on servers, FC switch, Storage to have that servers see LUNs using either switch at the same time.  Second question is When we get things working from setting in question one how to enhance our solutions using secondary paths (doted lines on drawing) from FC switches to Storage.  VNX box have this software VNX-Block-Operating-Environment 05.31.000.5.006 -UnisphereQoSManager -UnisphereBlock -UnisphereAnalyzer -Unisphere -ThinProvisioning -SnapView -SANCopy -FASTCache -FAST  If you need additional info just ask.  EDIT I don't need step by step instruction (that would be nice), you can just gently nudge me to some papers to read.
VNX 5300 with HP FC Switches