Hitachi

JP1 Version 12 JP1/Network Node Manager i Setup Guide


17.2 Comparison of approaches to NNMi data resilience

The following table compares several aspects of these two approaches to NNMi data resilience.

Table 17‒1: NNMi data resilience comparison

Comparison item

NNMi application failover

NNMi running in an HA cluster

Required software products

NNMi

  • NNMi

  • A separately purchased HA product

Time to failover

Time needed to process the transaction logs (under normal conditions, 10 to 60 minutes)

Under normal conditions, 5 to 30 minutes

Transparency of failover

Partial.

The IP address of the NNMi management server changes to the physical address of what was the standby server. Users must use the new IP address to connect to the NNMi console.

Complete.

All connections use the virtual IP address of the HA cluster, which does not change in the event of failover.

Relative proximity of active and standby servers

LAN or WAN

LAN or WAN (some HA products only)

Interaction with global network management

Application failover

Global and regional managers cannot be configured for application failover.

HA
  • Each global manager and each regional manager can be configured for HA.

  • Each of these configurations requires two physical systems.

  • When failover occurs on a global manager or regional manager, NNMi re-establishes the connections between the global managers and regional managers.

NNMi maintenance

NNMi must be taken out of the application failover cluster before applying a patch or upgrading.

NNMi can be patched and upgraded without unconfiguring HA.