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
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