Upgrade And Downgrade Considerations For The Port Grouping Policy; Device Load Balancing Policy; Enabling Wwn Load Balancing; Disabling Device Load Balancing - Brocade Communications Systems 8 Administrator's Manual

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Device Load Balancing Policy

Upgrade and downgrade considerations for the
Port Grouping policy
Downgrading to Fabric OS v6.3.0 or earlier is supported. Note the following considerations when
upgrading and downgrading from Fabric OS v6.4.0 to Fabric OS v6.3.0 and earlier:
•
•

Device Load Balancing Policy

When Device Load Balancing is enabled, devices mapped to a port group always log into the
least-loaded N_Port in that port group. This helps to distribute the login load on each of the
N_Ports. This policy is intended for use in conjunction with device-based mapping. It provides an
automatic approach to mapping devices to the least loaded N_Port within an N_Port group. To
effectively use this policy, we recommend that you map devices to desired N_Port groups before
enabling this policy.The Port Grouping policy must be enabled before you can enable Device Load
Balancing.
Manually created mappings from devices an N_Port take precedence over automatically created
mappings. Refer to
mapping. For more information on device mapping, refer to

Enabling WWN Load Balancing

Use the following steps to enable Device Load Balancing.
1. Connect to the switch and log in using an account assigned to the admin role.
2. Enter the configupload command to save the switch's current configuration.
3. The Port Grouping policy must be enabled to enable Device Load Balancing. Enter the ag
4. Enter the ag

Disabling Device Load Balancing

Before disabling this policy, you should save the configuration using the configupload command in
case you need this configuration again.
1. Connect to the switch and log in using an account assigned to the admin role.
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When upgrading to Fabric OS v6.4.0, the PG policy that was enforced in Fabric OS v6.3.0
continues to be enforced in Fabric OS v6.4.0 and the port groups are retained. You should save
the configuration file using the configupload command in case you might need this
configuration again.
If you upgrade from Fabric OS 5.3.0 to 6.0 or higher, you will not see any change in device
behavior where the Port Grouping policy is enabled by default.
"Mapping priority"
--policyshow command to determine if the Port Grouping policy is enabled. If it is not enabled,
enter ag --policyenable pg to enable this policy.
policyenable wwnloadbalance command to enable the Device Load Balancing
--
policy. Note that since in Fibre Channel devices are identified by their WWNs, CLI commands
use device WWNs.
on page 22 for details on connection priority for AG port
"Device-based mapping" on page 15.
Access Gateway Administrator's Guide
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