HP 8/8 Brocade Access Gateway Administrator's Guide v6.3.0 (53-1001345-01, Jul - Page 52

Failover, Failover configurations in Access Gateway

Get HP 8/8 PDF manuals and user guides View all HP 8/8 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 52 highlights

3 Failover Failover Access Gateway Failover ensures maximum uptime for the servers. When a port is configured as an N_Port, failover is enabled by default and is enforced during power-up. Failover allows F_Ports to automatically remap to an online N_Port if the primary N_Port goes offline. If multiple N_Ports are available for failover, failover evenly distributes the F_Ports to available N_Ports belonging to the same N_Port group. If no other N_Port is available, failover does not occur. AG provides an option to specify a secondary failover N_Port for an F_Port. This N_Port is called the preferred secondary N_Port for failover. If you specify a preferred secondary N_Port for any of the F_Ports, and if the primary mapped N_Port goes offline, the F_Ports will fail over to the preferred secondary N_Port (if it is online), then re-enable. The preferred secondary N_Port that you specify must be online; otherwise, the F_Ports will become disabled. The preferred secondary N_Port is defined per F_Port. For example, if two F_Ports are mapped to a primary N_Port 1, you can define a secondary N_Port for one of those F_Ports and not define a secondary N_Port for the other F_Port. Refer to "Adding a preferred secondary N_Port" on page 34 for more information. Failover configurations in Access Gateway The following sequence describes how a failover event occurs: • An N_Port goes offline. • All F_Ports mapped to that N_Port are disabled. • If the N_Port Failover configuration is enabled and a preferred secondary N_Port is specified for the F_Port (and that N_Port is online), the F_Port fails over to the secondary N_Port, then re-enables. If the preferred port is not set, then the F_Port fails over to any available N_port in the port group. Otherwise the F_ports will be evenly distributed among available online N_ports that are part of the same port group. Example: Failover configuration This example shows the failover behavior in a scenario where two fabric ports go offline, one after the other. Note that this example assumes that no preferred secondary N_Port is set for any of the F_Ports. • First the Edge switch F_A1 port goes offline, as shown in Figure 8 on page 33 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 8 on page 33 Example 2 (right), causing the corresponding Access Gateway N_2 port to be disabled. The ports mapped to N_2 (F_1, F_3, and F_4) fail over to N_3 and N_4. Note that the F_Ports are evenly distributed to the remaining online N_Ports and that the F_2 port did not participate in the failover event. 32 Access Gateway Administrator's Guide 53-1001345-01

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
32
Access Gateway Administrator’s Guide
53-1001345-01
Failover
3
Failover
Access Gateway Failover ensures maximum uptime for the servers. When a port is configured as an
N_Port, failover is enabled by default and is enforced during power-up. Failover allows F_Ports to
automatically remap to an online N_Port if the primary N_Port goes offline. If multiple N_Ports are
available for failover, failover evenly distributes the F_Ports to available N_Ports belonging to the
same N_Port group. If no other N_Port is available, failover does not occur.
AG provides an option to specify a secondary failover N_Port for an F_Port. This N_Port is called the
preferred secondary N_Port for failover. If you specify a preferred secondary N_Port for any of the
F_Ports, and if the primary mapped N_Port goes offline, the F_Ports will fail over to the preferred
secondary N_Port (if it is online), then re-enable.
The preferred secondary N_Port that you specify must be online; otherwise, the F_Ports will
become disabled. The preferred secondary N_Port is defined per F_Port. For example, if two
F_Ports are mapped to a primary N_Port 1, you can define a secondary N_Port for one of those
F_Ports and not define a secondary N_Port for the other F_Port. Refer to
“Adding a preferred
secondary N_Port”
on page 34 for more information.
Failover configurations in Access Gateway
The following sequence describes how a failover event occurs:
•
An N_Port goes offline.
•
All F_Ports mapped to that N_Port are disabled.
•
If the N_Port Failover configuration is enabled and a preferred secondary N_Port is specified
for the F_Port (and that N_Port is online), the F_Port fails over to the secondary N_Port, then
re-enables. If the preferred port is not set, then the F_Port fails over to any available N_port in
the port group. Otherwise the F_ports will be evenly distributed among available online
N_ports that are part of the same port group.
Example: Failover configuration
This example shows the failover behavior in a scenario where two fabric ports go offline, one after
the other. Note that this example assumes that no preferred secondary N_Port is set for any of the
F_Ports.
•
First the Edge switch F_A1 port goes offline, as shown in
Figure 8
on page 33 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 8
on page 33 Example 2 (right), causing
the corresponding Access Gateway N_2 port to be disabled.
The ports mapped to N_2 (F_1, F_3, and F_4) fail over to N_3 and N_4. Note that the F_Ports
are evenly distributed to the remaining online N_Ports and that the F_2 port did not participate
in the failover event.