Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 71)

Brocade Virtual ADX Server Load Balancing Guide 55
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Primary and backup servers
2
Slow start of the backup and the primary servers
If the server selection predictor is least connection, the backup server can be overwhelmed by the
flood of the new connections when its primary server goes down. The same is true when the
primary server goes back up and starts to take over the connections from the backup server. The
slow start mechanism will be used whenever the switching of the backup or primary server
happens, to give the server the chance to ramp up.
The slow start mechanism of the backup or the primary server will be the same as the one currently
being used for the new servers. The slow start parameters are configured on the real server port.
NOTE
The slow start is enabled by default.
One backup per primary port or server
There will be the following restrictions:
• At the real port mode, the primary and backup ports have a one-to-one relationship. That is,
the primary port can only be backed up by one backup port, and the backup port can only back
up one primary port.
• At the real server mode, the primary and backup servers have a one-to-one relationship. That
is, the primary server can only be backed up by one backup server, and the backup server can
only back up one primary server.
The back port has the precedence over the back server
When both the port and the server backup are configured, the port configuration takes precedence
over the server configuration.
For instance, the following is configured:
• The server C is the backup of the server A.
• The port 8080 of the server C is the backup of the port 8080 of the server B.
Then, the port 8080 of the server C becomes the backup of the port 8080 of the server B, but not
the backup of the port 8080 of the server A.
Real server backup commands
• “Server backup association” on page 55
• “Server port backup association” on page 56
• “Display the backup bindings” on page 57
Server backup association
This command is to configure the backup server for a particular primary server, in the real server
mode.
Syntax: [no] backup [server-name]