Coyote Point Systems Equalizer, Installation And Administration Manual

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Configuring Equalizer Operation
Equalizer Installation and Administration Guide 51
Setting up a Failover Configuration
You can use a second Equalizer as a hot backup. Should the Equalizer that’s currently
handling requests fail, the backup will automatically take over.
To use a second Equalizer as a hot backup, you need to install the backup Equalizer so that
its network interfaces correspond to the network interfaces of its sibling:
■
The external interface of the backup unit must be plugged into the same hub or
switch that the external interface of the primary unit is plugged into.
■
The internal interface of the backup unit must be plugged into the same hub or
switch that the internal interface of the primary unit is plugged into.
One of the Equalizers must be designated as the default primary and the other designated as
the default backup. When both Equalizer’s are booted at the same time, the Equalizer
designated as the default primary will be activated. Should the primary Equalizer fail, the
backup will take over. When the failed unit is brought back online, it assumes the backup
role until another failure occurs or its sibling is rebooted.
To set up a failover configuration, perform the following procedure on both Equalizers:
1. Log into the Equalizer Administration interface with edit access.
2. Select Configure Failover from the Equalizer menu in the main menu bar. The Change
Equalizer Parameters dialog is displayed in the right frame. By default, the
Redundancy tab is visible.
Figure 33 Setting up a failover configuration
3. Select your configuration type from the Configuration Type pull-down:
■
If you have a dual-network configuration, select Dual Network.
■
If you have a single-network configuration, select Single Network. If you select
Single Network, the Sibling Internal Address and Equalizer Failover address
fields are not applicable.
4. Select the appropriate failover role for this Equalizer, Default Primary or Default
Backup
. (If you’re not using a second Equalizer as a backup, select No Backup.)
5. Specify the requested IP addresses:
■
Sibling’s External IP: The external network address of the other Equalizer.
■
Sibling’s Internal IP: The internal network address of the other Equalizer. (Only
specified for dual network configurations.)