HP 8/40 Access Gateway Administrator's Guide (53-1001760-01, June 2010) - Page 56

Port Grouping policy modes, Creating a port group and enabling Automatic Login Balancing mode

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3 Port Grouping policy Port Grouping policy modes You can enable and disable the following Port Grouping policy modes when you create port groups using the pgcreate command. Alternately, you can enable these policies using the ag--pgsetmodes command. Automatic Login Balancing If Automatic Login Balancing mode is enabled for a port group and an F_Port goes offline, logins in the port group are redistributed among the remaining F_Ports. Similarly, if an N_Port comes online, port logins in the PG are redistributed to maintain a balanced N_Port-to-F_Port ratio. Considerations for Automatic Login Balancing Please consider the following facts about this feature: • Automatic Login Balancing is disruptive. However, you can minimize disruption by disabling or enabling rebalancing of F_Ports on F_Port offline or N_Port online events. Refer to "Rebalancing F_Ports" on page 37. • You must explicitly enable Automatic Login Balancing on a port group. • If an N_Port is deleted from a port group enabled for Automatic Login Balancing, the F_Ports mapped to that N_Port stay with the port group as long as there are other N_Ports in the group. Only the N_Port is removed from the port group. This is because the F_Ports are logically associated with the port groups that are enabled for Login Balancing. This is not the case for port groups not enabled for Automatic Login Balancing. When you delete an N_Port from one of these port groups, the F_Ports that are mapped to the N_Port move to PG0 along with the N_Port. This is because the F_Ports are logically associated with the N_Ports in port groups not enabled for Login Balancing. Managed Fabric Name Monitoring (MFNM) Fabric Name Monitoring mode automatically detects whether all the N_Ports within a port group are physically connected to the same physical or virtual fabric. Once a misconnection is detected there are two methods to handle it, depending on the operating mode. For "default" mode a message is logged into RASLOG. For "managed" mode (MFNM), automatic failover disables on all N_Ports within the N_Port group, and a a message displays in the RAS log about multiple fabrics. In both default and managed mode, the system queries the fabric name once every 120 seconds to detect inconsistencies such as a port group being connected to multiple fabrics. You can configure the monitoring timeout value to something other than 120 seconds using the ag --pgfnmtov command. Refer to "Setting the current fabric name monitoring timeout value" on page 39. The --pgfnmtov command is blocked on a Brocade 8000 during and after creation of a port group. Creating a port group and enabling Automatic Login Balancing mode 1. Connect to the switch and log in using an account assigned to the admin role. 2. Enter the ag --pgcreate command with appropriate operands to create a port group. In the following example, a port group named "FirstFabric" is created that includes N_Ports 1 and 3 and has automatic login balancing (lb) enabled. switch:admin> ag --pgcreate 3 "1;3" -n FirstFabric1 -m "lb" 36 Access Gateway Administrator's Guide 53-1001760-01

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36
Access Gateway Administrator’s Guide
53-1001760-01
Port Grouping policy
3
Port Grouping policy modes
You can enable and disable the following Port Grouping policy modes when you create port groups
using the
pgcreate
command. Alternately, you can enable these policies using the
ag--pgsetmode
s
command.
Automatic Login Balancing
If Automatic Login Balancing mode is enabled for a port group and an F_Port goes offline, logins in
the port group are redistributed among the remaining F_Ports. Similarly, if an N_Port comes online,
port logins in the PG are redistributed to maintain a balanced N_Port-to-F_Port ratio.
Considerations for Automatic Login Balancing
Please consider the following facts about this feature:
•
Automatic Login Balancing is disruptive. However, you can minimize disruption by disabling or
enabling rebalancing of F_Ports on F_Port offline or N_Port online events. Refer to
“Rebalancing F_Ports”
on page 37.
•
You must explicitly enable Automatic Login Balancing on a port group.
•
If an N_Port is deleted from a port group enabled for Automatic Login Balancing, the F_Ports
mapped to that N_Port stay with the port group as long as there are other N_Ports in the group.
Only the N_Port is removed from the port group. This is because the F_Ports are logically
associated with the port groups that are enabled for Login Balancing. This is not the case for
port groups not enabled for Automatic Login Balancing. When you delete an N_Port from one of
these port groups, the F_Ports that are mapped to the N_Port move to PG0 along with the
N_Port. This is because the F_Ports are logically associated with the N_Ports in port groups not
enabled for Login Balancing.
Managed Fabric Name Monitoring (MFNM)
Fabric Name Monitoring mode automatically detects whether all the N_Ports within a port group
are physically connected to the same physical or virtual fabric. Once a misconnection is detected
there are two methods to handle it, depending on the operating mode. For “default” mode a
message is logged into RASLOG. For “managed” mode (MFNM), automatic failover disables on all
N_Ports within the N_Port group, and a a message displays in the RAS log about multiple fabrics.
In both default and managed mode, the system queries the fabric name once every 120 seconds
to detect inconsistencies such as a port group being connected to multiple fabrics. You can
configure the monitoring timeout value to something other than 120 seconds using the
ag
--pgfnmtov
command. Refer to
“Setting the current fabric name monitoring timeout value”
on
page 39.
The
--pgfnmtov
command is blocked on a Brocade 8000 during and after creation of a port group.
Creating a port group and enabling Automatic Login Balancing mode
1.
Connect to the switch and log in using an account assigned to the admin role.
2.
Enter the
ag
--
pgcreate
command with appropriate operands to create a port group. In the
following example, a port group named “FirstFabric” is created that includes N_Ports 1 and 3
and has automatic login balancing (lb) enabled.
switch:admin>
ag --pgcreate 3 “1;3” -n FirstFabric1 -m “lb”