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100

101

Failover

Note that the coyote icons at the top of the left frame of the EQ/OS GUI will not change to indicate when the

EQ/OS 10 system is the primary unit -- that is, the EQ/OS 10 system will

always

have the sitting coyote icon next

to it. For the Beta, this is normal and expected. Always use the Help > About screen or the Equalizer log

(Equalizer > Status > Event Log) to check failover status on EQ/OS 8.6.

Failover Between Two EQ/OS 10 Systems

The procedures in this section show you how to configure failover using two Equalizers running EQ/OS 10.

Types of Failover Configurations

Active/Passive Failover

When two Equalizers are configured into Active/Passive failover, they form a "failover pair". An Equalizer in a

failover pair is called a "peer". At any given time, only one of the Equalizers in a failover pair is actually servicing

requests sent to the cluster IP addresses defined in the configuration -- this unit is called the "active peer" or the

"current primary" Equalizer in the failover pair. The other Equalizer, called the “passive peer” or "current backup",

does not process any client requests.

Both units continually send "heartbeat probes" or "failover probes" to one another. If the current primary does not

respond to heartbeat probes, a failover occurs. In this scenario the current backup Equalizer assumes the primary

role by assigning the cluster IP addresses to its network interfaces and begins processing cluster traffic.

Refer to "Configuring Active/Passive Failover (CLI)" on page 443 or "Configuring Active/Passive Failover (GUI)"

on page 451 for procedures on configuring Active/Passive failover.

Active/Active Failover

Active/Active (A/A) failover is a feature of EQ/OS 10 that allows clusters to be Active on

both

peers that are in

failover. For the same failure situations that cause a peer to take over all the cluster and floating IP addresses in an

Active/Passive failover configuration, A/A operates the same way - that is that a healthy peer takes over all of the

cluster and failover IPs. However, if and when the “sick” peer is healed, there is no automatic return migration of

the clusters and the user needs to invoke a “rebalance” command to cause this to happen.

Active/Active failover can be configured between two EQ/OS 10 Systems only.

Refer to "Configuring Active/Passive Failover (CLI)" on page 443 or "Configuring Active/Passive Failover (GUI)"

on page 451 for procedures on configuring Active/Active failover.

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