Hitachi

JP1 Version 12 JP1/Network Node Manager i Setup Guide


18.4.2 Application failover scenarios

There are several possible problems that can cause the active NNMi management server to stop sending heartbeats and to initiate a failover.

This subsection explains failover of the NNMi management server because an error occurred under various scenarios.

Table 18‒1: Correspondence between possible errors and scenarios

Possible error

Error location

Active server

Standby server

Server

Server failure#1

Scenario 1

Scenario 6

OS stoppage

Scenario 2

Scenario 6

Process

nnmcluster stoppage

Scenario 3

Scenario 6

Stoppage of process other than nnmcluster

Scenario 5

N/A#2

Network

Communication error

Scenario 4

Scenario 4

#1: Server failure assumes a server stoppage caused by a hardware or OS error.

#2: Not applicable because the standby server's NNMi is stopped.

Organization of this subsection

(1) When a failover occurs

In the following scenarios 1 through 3, NNMi fails over to the standby server if automatic failover is enabled and continues to monitor the network:

(2) When no failover occurs

If an event occurs that is not covered by any of the scenarios described in (1) When a failover occurs, failover does not occur. The following are examples: