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3 primary/backup mode, Primary/backup mode – HP NonStop G-Series User Manual

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Event Delivery Management 55

Catch-up will only happen if MSGQUEUING is enabled otherwise the messages will be lost because the OVNM

will not send any Goback request to the NonStop.
The configuration changes on the Enterprise Management server to support broadcast mode require modifying

the ovnm_start script.

6-3 Primary/Backup Mode

In the Primary/Backup mode, OVNM is configured to send NonStop Events to a pair of Enterprise Management

Servers, one as Primary and the other as Backup.
The figure below shows a scenario of monitoring when the HPOM servers are configured for Primary or Backup

respectively.

Figure 6-2

Event Monitoring in Primary and Backup Mode – HPOM Environment

Table 6-1

Primary/Backup Mode for Guaranteed Event Delivery

Primary Server

Backup Server

Action

Enterprise
Manager
Service

OVNM
Connection to
NonStop Server

Enterprise
Manager Service

OVNM
Connection to
NonStop Server

Up

Up

Up

Up

Event Messages will go to Primary Server

Up

Up

Up

Down

Event Messages will go to Primary Server

Up

Up

Down

Up

Event Messages will go to Primary Server

Up

Up

Down

Down

Event Messages will go to Primary Server

Up

Down

Up

Up

Event Messages will Switch to Backup Server

Ev

en

t D

el

ive

ry

M

an

ag

em

en

t

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