HP StorageWorks 2/16V Brocade Access Gateway Administrator's Guide - Supportin - Page 18

Failover policy

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1 Failover policy Failover policy The Brocade Access Gateway N_Port failover policy allows hosts to automatically remap to an online N_Port if the N_Port they are connected to goes offline. The failover policy evenly distributes the F_Ports that are mapped to an offline N_Port among all the online N_Ports. The failover policy is a parameter of each N_Port. By default, the failover policy is enabled for all N_Ports. The following sequence describes how a failover event occurs: 1. An N_Port goes offline. 2. All F_Ports mapped to that N_Port are disabled. 3. If the N_Port failover policy is enabled, the disabled F_Ports are remapped to an online N_Port. The F_Ports are evenly distributed among the remaining online N_Ports. 4. The F_Port is re-enabled on the new N_Port. 5. The host establishes a new connection with the fabric. Example: Failover Policy This example shows the failover behavior in a scenario where two fabric ports go offline, one after the other. • First the edge switch F_A1 port goes offline, as shown in Figure 1-5 example 1 (left), causing the corresponding Access Gateway N_1 port to be disabled. The ports mapped to N_1 fail over; F_1 fails over to N_2 and F_2 fails over to N_3. • Next the F_A2 port goes offline, as shown in Figure 1-5 example 2 (right), causing the corresponding Access Gateway N_2 port to be disabled. 1-6 Access Gateway Administrator's Guide Publication Number: 53-1000430-01

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1-6
Access Gateway Administrator’s Guide
Publication Number: 53-1000430-01
Failover policy
1
Failover policy
The Brocade Access Gateway N_Port failover policy allows hosts to automatically remap to an online
N_Port if the N_Port they are connected to goes offline. The failover policy evenly distributes the
F_Ports that are mapped to an offline N_Port among all the online N_Ports. The failover policy is a
parameter of each N_Port. By default, the failover policy is enabled for all N_Ports.
The following sequence describes how a failover event occurs:
1.
An N_Port goes offline.
2.
All F_Ports mapped to that N_Port are disabled.
3.
If the N_Port failover policy is enabled, the disabled F_Ports are remapped to an online N_Port.
The F_Ports are evenly distributed among the remaining online N_Ports.
4.
The F_Port is re-enabled on the new N_Port.
5.
The host establishes a new connection with the fabric.
Example: Failover Policy
This example shows the failover behavior in a scenario where two fabric ports go offline, one after the
other.
•
First the edge switch F_A1 port goes offline, as shown in
Figure 1-5
example 1 (left), causing the
corresponding Access Gateway N_1 port to be disabled.
The ports mapped to N_1 fail over; F_1 fails over to N_2 and F_2 fails over to N_3.
•
Next the F_A2 port goes offline, as shown in
Figure 1-5
example 2 (right), causing the
corresponding Access Gateway N_2 port to be disabled.