Specifications

Scenario 4
In this case, Server B will do the following:
l Begin processing a communication failure event from Server A.
l Determine that it can still communicate with the Witness Server W and thus has quorum.
l Verify via Server W that Server A really appears to be lost and, thus, begin the usual failover
activity.
l Server B will now have the protected resources in service.
With B now acting as Source, communication resumes for Server A
Based on the previous scenario, Server A now resumes communications. Server B will process a
comm_up event, determine that it has quorum (all three of the nodes are visible) and that it has the
resources in service. Server A will process a comm_up event, determine that it also has quorum and
that the resources are in service elsewhere. Server A will not bring resources in service at this time.
With B now acting as Source, Server A is powered on with communications to the other
nodes
In this case, Server B will respond just like in the previous scenario, but Server A will process an lcm_
avail event. Server A will determine that it has quorum and respond normally in this case by not
bringing resources in service that are currently in service on Server B.
With B now acting as Source, Server A is powered on without communications
In this case, Server A will process an lcm_avail event and Servers B and W will do nothing since they
can’t communicate with Server A. Server A will determine that it does not have quorum since it can
only communicate with one of the three nodes. In the case of not having quorum, Server A will not
bring resources in service.
Scenario 4
Communications fail between Server A and all other nodes (A's network fails but A is still
running)
In this case, Server B will do the following:
l Begin processing a communication failure event from Server A.
l Determine that it can still communicate with the Witness Server W and thus has quorum.
l Verify via server W that Server A really appears to be lost and, thus, begin the usual failover
activity.
l Server B will now have the protected resources in service.
Also, in this case, Server A will do the following:
l Begin processing a communication failure event from Server B.
l Determine that it cannot communicate with Server B nor the Witness Server W and thus does
not have quorum.
l Immediately reboot ("fastboot" is the default behavior causing a hard reboot).
SteelEye Protection Suite for Linux113