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 load balancers 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" load balancer in the
failover pair. The other load balancer, 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 load balancer 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)
or
Configuring Active/Passive Failover (GUI)
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)
or
Configuring Active/Passive Failover (GUI)
for procedures on configuring Active/Active failover.
N+1 Failover
N+1 Failover is a feature of EQ/OS 10 where the failover configuration consists of multiple active
peers ("N") plus 1 passive peer. In this type of failover configuration, the Equalizer clusters are
instantiated on all "N" peers and organized into failover groups. If the passive, or backup peer's
connectivity for a failover group's resources is judged to be "healthier" that the peer on which the
group is running, then the group fails over to the passive peer, which becomes the Primary peer.
N+1 failover can be configured between two EQ/OS 10 Systems only.
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
All Rights Reserved.
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