HP StorageWorks 4000/6000/8000 .HP StorageWorks SAN Design Reference Guide, Pa - Page 197

HBA NPIV connectivity guidelines Figure 54 shows the logical relationship between virtual WWPNs and a VOS with HBA NPIV enabled. A server running a VOS has three instances of VMs. The server has an HBA with a manufacturing-assigned WWPN (20:00:00:00:c9:56:31:ba), and is connected to port 8 of a switch whose domain ID is 37. The VOS generates three virtual WWPNs and maps them to the VMs. The VOS uses an operating system-specific algorithm to create the WWPNs, which may include a registered vendor unique ID. Server VM1 WWPN: 48:02:00:0c:29:00:00:1a VM2 WWPN: 48:02:00:0c:29:00:00:24 VM3 WWPN: 48:02:00:0c:29:00:00:2a Virtual OS HBA WWPN: 20:00:00:00:c9:56:31:ba 48:02:00:0c:29:00:00:1a 48:02:00:0c:29:00:00:24 48:02:00:0c:29:00:00:2a Port 8 Switch Domain ID: 37 Name Server : : FCID WWPN 370800 20:00:00:00:c9:56:31:ba 370801 48:02:00:0c:29:00:00:1a 370802 48:02:00:0c:29:00:00:24 370803 48:02:00:0c:29:00:00:2a Fabric 26411a Figure 54 VOS with HBA NPIV enabled . When using HBA NPIV, consider the following: • When a VOS initializes, the HBA performs a fabric login using the manufacturing-assigned WWPN, and the switch assigns a FCID for the login session. The HBA's WWPN and associated FCID are logged in the fabric name server. When an NPIV-enabled VM initializes, the HBA performs another fabric login using the virtual WWPN associated with that VM, which creates another FCID and entry in the fabric name server. This process is repeated for each NPIV-enabled VM. • When a VM stops, the entry is removed from the fabric name server. The relationship between FCIDs assigned to multiple N_Ports logged in on the same F_Port is not defined by the standards; instead, the switch vendors provide implementation details. In Figure 54, the FCIDs have common values for the WWPN domain and area fields, and the port field value is incremented for each new login. SAN Design Reference Guide 197