Configuring N+1 Failover
N+1 Failover is a feature 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 provides the ability to configure up to 4 Peers in a failover configuration. All peers
will be "heartbeating" with each other and all synchronizing configuration. If a Peer "fails", for
each failover group (F/O) group affected by the failure, one and only one of the other Peers will
take over the F/O Group based on:
1. Which Peer in the F/O group has the best connectivity to servers, routers, etc. In case of a
tie amongst one or more Peers, the Peer with the greatest System ID hex value or " sysid"
will take over the F/O group. For example, if 2 peers have the same level of connectivity
with servers, routers, etc, and one "sysid" is "003048BC2C8A" and the other is
"003048D52AA2". The second "sysid" has a higher hex value and will take over the F/O
group.
Note
- All flavors of Microsoft© Windows include a hex calculator. A free, downloadable Hex Calculator widget for Mac
OX is also available.
2. The user can subsequently adjust the load across the Peers by managing the preferred Peer
for each F/O Group and executing the rebalance function.
Note
- Currently, if a failover event occurs, all F/O Groups are moved when a failover event occurs, even if it only affects
a subset of the F/O Groups. Failover occurs on a F/O Group basis. For example, if an interface goes down, only the
affected F/O Group(s) will be moved.
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
All Rights Reserved.
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