Port Grouping Policy; How Port Groups Work; Figure 9 Port Grouping Behavior - HP StoreFabric SN6500B Administrator's Manual

Port Grouping policy

Use the Port Grouping (PG) policy to partition the fabric, host, or target ports within an AG-enabled
module into independently operated groups. Use the PG policy in the following situations:
•
•

How port groups work

Create port groups using the ag --pgcreate command. This command groups N_Ports together as
"port groups." By default, any F_Ports mapped to the N_Ports belonging to a port group will
become members of that port group. Port grouping fundamentally restricts failover of F_Ports to
the N_Ports that belong to that group. For this reason, an N_Port cannot be member of two port
groups. The default PG0 group contains all N_Ports that do not belong to any other port groups.
Figure 9
being routed through that port will fail over to any of the N_Ports that are part of that port group
and are currently online. For example, if N_Port 4 goes offline, then F_Ports 7 and 8 are routed
through to N_Port 3 as long as N_Port 3 is online because both N_Ports 3 and 4 belong to the
same port group, PG2. If no active N_Ports are available, the F_Ports are disabled. The F_Ports
belonging to a port group do not fail over to N_Ports belonging to another port group.
FIGURE 9
When a dual redundant fabric configuration is used, F_Ports connected to a switch in AG mode can
access the same target devices from both of the fabrics. In this case, you must group the N_Ports
connected to the redundant fabric into a single port group. It is recommended to have paths fail
over to the redundant fabric when the primary fabric goes down. Refer to
Access Gateway Administrator's Guide
53-1002743-01
When connecting the AG module to multiple physical or virtual fabrics.
When you want to isolate specific hosts to specific fabric ports for performance, security, or
other reasons.
shows that if you have created port groups and then an N_Port goes offline, the F_Ports
F_Port1
N_Port1
F_Port2
F_Port3
N_Port2
F_Port4
AG
F_Port5
N_Port3
F_Port6
F_Port7
N_Port4
F_Port8
Port grouping behavior
Fabric-1
PG1
Fabric-2
PG2

Port Grouping policy

Storage
Array-1
Storage
Array-2
Figure 10.
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