User guide

Virtual Connect fabrics 145
Bay groups
In a multi-enclosure environment, all enclosures must have the same VC-FC and FlexFabric module
configuration. For example, if the local enclosure has VC-FC modules in bays 3 and 4, each remote
enclosure must also have VC-FC modules in bays 3 and 4. This is called an FC bay group. The concept of the
FC bay group is applicable to both the FabricAttach and DirectAttach VC SAN fabric. This ensures that the
profile mobility rules are preserved when a server profile is moved between enclosures within the same VC
domain. For more information, see the HP Virtual Connect for c-Class BladeSystem Setup and Installation
Guide on the Installing tab of the HP BladeSystem Technical Resources website
(http://www.hp.com/go/bladesystem/documentation).
When creating a FabricAttach VC SAN fabric in the multi-enclosure environment, consider the following:
• All VC-FC modules and FC-capable uplinks on the VC FlexFabric modules within the same bay group
must be connected to the same SAN fabric.
• All modules within the same bay group must be of the same module type and have identical cabling on
the uplink ports.
When creating a DirectAttach VC SAN fabric in the multi-enclosure environment, consider the following:
• All VC FlexFabric modules must be connected to the same 3PAR storage system(s).
• Server profile migration of a SAN-booted server between enclosures is not supported.
• For domains managed by VCEM, a server profile migration of a SAN-booted server between
enclosures within the same VCDG or between different VCDGs is not supported.
To perform a server profile migration of a SAN-booted server between enclosures directly attached to a 3PAR
storage system in the VC multi-enclosure environment, you must perform the following steps manually:
1. Power off the server.
2. Un-assign the server profile.
3. Change the Primary and Secondary Target WWNs in the FC Boot Parameters section of the profile to
reflect the WWNs of the 3PAR storage array ports directly connected to the destination enclosure. For
more information about the FC boot parameters, see "Fibre Channel boot parameters (on page 196)."
4. Assign the profile to the destination location.
5. Power on the destination server.
Double-dense mode
In double-dense mode, bays 7 and 8 must contain the same type of VC-FC or FlexFabric module as bays 5
and 6. When a fabric is created on bay 5 or 6, the corresponding uplink ports from bays 7 or 8 are also
considered part of the fabric. This allows connectivity from the B-side of the server.
Managing fabrics
Use the following screens to manage fabric settings:
• Define SAN Fabric screen (on page 146)
o Define a SAN fabric, including selecting login re-distribution for SAN fabrics using HP VC
FlexFabric 10Gb/24-port Modules
• SAN Fabrics (External Connections) screen (on page 153)