Dell PowerEdge M420 8/4 Gbps FC SAN Module Administrator's Guide - Page 29

Port Grouping policy 3 Disabling the Port Grouping policy 1. Connect to the switch and log in using an account assigned to the admin role. 2. Enter the ag --policydisable command. switch:admin> ag --policydisable pg . Port Grouping policy modes You can modify certain default behavior such as the following within a port group: • Login Balancing (LB) If login balancing mode is enabled for a port group and an internal port (F_Port) goes offline, logins in the port group are redistributed among the remaining internal ports. Similarly, if an external port (N_Port) comes online, port logins in the PG are redistributed to maintain a balanced external-to-internal port ratio. Please note the following facts about LB mode: - LB is disruptive. However, you can minimize disruption by disabling or enabling rebalancing of internal ports on internal-port-offline or external-port-online events. - You must be explicitly enable LB on a port group. - Internal ports can be directly added to port groups that have Login Balancing mode enabled. • Managed Fabric Name Monitoring (MFNM) Fabric Name Monitoring mode automatically detects whether all the external ports (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 external ports within the external port group. 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 17. Creating a port group and enabling login balancing mode 1. Connect to the FC SAN Module 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 external ports (N_Ports) 1 and 3 and has login balancing enabled. switch:admin> ag --pgcreate 3 "1;3" -n FirstFabric1 -m "lb" Port Group 3 created successfully 3. Enter the ag --pgshow command to verify the port group was created. switch:admin> ag --pgshow PG_ID PG_Name PG_Mode N_Ports F_Ports 0 pg0 lb,mfnm none none Dell 8/4Gbps FC SAN Module Administrator's Guide 15 53-1001345-01