Dell PowerEdge M420 8/4 Gbps FC SAN Module Administrator's Guide - Page 26

Automatic Port Configuration policy considerations, Port Grouping policy, How port groups work

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3 Port Grouping policy 4. Enter the command ag --policydisable auto to disable the APC policy. 5. At the command prompt, type Y to disable the policy. switch:admin> ag --policydisable auto Default factory settings will be restored. Default mappings will come into effect. Please save the current configuration using configupload. Do you want to continue? (yes, y, no, n): [no] y Access Gateway configuration has been restored to factory default 6. Enter the switchenable command to enable the module. Automatic Port Configuration policy considerations Following are the considerations for the Automatic Port Configuration policy: • The APC and the PG policies cannot be enabled at the same time. • You cannot manually map ports with this policy enabled. Port Grouping policy The Port Grouping (PG) policy is enabled by default. Use the PG policy to partition the fabric and host ports within a module into independently operated groups. Use the PG policy in the following situations: • When connecting the module to multiple physical or virtual fabrics. • When you want to isolate specific hosts to specific fabric ports for performance, security, or other reasons. How port groups work Create port groups using the ag --pgcreate command. This command groups external ports (N_Ports) together as "port groups." Any internal ports (F_Ports) mapped to the external ports belonging to a port group will become members of that port group. Port grouping fundamentally restricts failover of internal ports to the external ports that belong to that group. For this reason an external ports cannot be member of two port groups. The default PG0 group contains all external ports that do not belong to any other port groups. Figure 3 on page 13 shows that.if you have created port groups and then an external port (N_Port) goes offline, the internal ports (F_Ports) being routed through that port will fail over to any of the external ports that are part of that port group and are currently active. For example, if external port 4 goes offline then internal ports 7 and 8 are routed through to external port 3 as long as external port 3 is online because both external ports 3 and 4 belong to the same port group, PG2. If no active external ports are available, the internal ports are disabled. The internal ports belonging to a port group do not fail over to external ports belonging to another port group. 12 Dell 8/4Gbps FC SAN Module Administrator's Guide 53-1001345-01

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12
Dell 8/4Gbps FC SAN Module Administrator’s Guide
53-1001345-01
Port Grouping policy
3
4.
Enter the command
ag
--
policydisable auto
to disable the APC policy.
5.
At the command prompt, type
Y
to disable the policy.
switch:admin>
ag --policydisable auto
Default factory settings will be restored.
Default mappings will come into effect.
Please save the current configuration using configupload.
Do you want to continue? (yes, y, no, n): [no] y
Access Gateway configuration has been restored to factory default
6.
Enter the
switchenable
command to enable the module.
Automatic Port Configuration policy considerations
Following are the considerations for the Automatic Port Configuration policy:
•
The APC and the PG policies cannot be enabled at the same time.
•
You cannot manually map ports with this policy enabled.
Port Grouping policy
The Port Grouping (PG) policy is enabled by default. Use the PG policy to partition the fabric and
host ports within a module into independently operated groups. Use the PG policy in the following
situations:
•
When connecting the module to multiple physical or virtual fabrics.
•
When you want to isolate specific hosts to specific fabric ports for performance, security, or
other reasons.
How port groups work
Create port groups using the
ag
--
pgcreate
command. This command groups external ports
(N_Ports) together as “port groups.” Any internal ports (F_Ports) mapped to the external ports
belonging to a port group will become members of that port group. Port grouping fundamentally
restricts failover of internal ports to the external ports that belong to that group. For this reason an
external ports cannot be member of two port groups. The default PG0 group contains all external
ports that do not belong to any other port groups.
Figure 3
on page 13 shows that.if you have created port groups and then an external port (N_Port)
goes offline, the internal ports (F_Ports) being routed through that port will fail over to any of the
external ports that are part of that port group and are currently active. For example, if external port
4 goes offline then internal ports 7 and 8 are routed through to external port 3 as long as external
port 3 is online because both external ports 3 and 4 belong to the same port group, PG2. If no
active external ports are available, the internal ports are disabled. The internal ports belonging to a
port group do not fail over to external ports belonging to another port group.