HP VAN SDN Controller Administrator Guide

60
Controller Fault Tolerance
The threshold for controller fault tolerance is 2n+1, where n is the number of failed controllers
allowed in an active team. HP VAN SDN Controller teaming supports a team of three
controllers. In a team of three controllers, n = 1; one controller in a team of three can fail
without suspending team operation. If one such controller does go down, a stateful failover
occurs, in which the remaining two members resume together from the point of failure, and
the team continues to operate. As long as any two of the teamed controllers in the network
are active, the network remains in a managed state. If a second controller in the team fails,
then n exceeds the maximum allowed, and the remaining controller transitions to a SUSPEND
state. When at least two controllers in the team become active, team operation resumes, with
the one having the highest priority operating as the team manager.
Note
In teamed controller operation, maintaining the integrity of the controller state
information requires that a minimum of two controllers in a team of three must be
active at all times. The failure of all but one of the controllers places the entire team
in a SUSPEND state. (The remaining teamed controller does not operate in
standalone mode.)
Error Messages for Team Configuration
Message
Description
Build version not consistent on all the
systems.
Not all systems on the team have the same
controller build version. Update the team as
needed to have the same build version.
Failed to cache team configuration.
There has been a team configuration storage
failure on a persistence storage (hard disc).
Failed to delete the cached team
configuration.
Deletion of a team configuration from a
persistent storage device has failed.
Failed to read cache.
An attempt to read the team configuration
from persistent storage has failed.
Invalid team configuration. <Message>.
The team configuration JSON is not valid.
Programming team alias < ip-address >
failed
See the "
Team Alias Note" on page 61
Team delete failed, as delete failed on
quorum number of systems
A team delete has failed on a quorum
number of systems.
Teaming already configured on this system.
Teaming is already running on the system.
Teaming bootstrap is in progress, cannot
configure team.
Teaming bootstrap is alreading running.
Teaming not configured on this system.
An attempt has been made on a standalone