OVNPM 1.5.2 - Performance Agent for NonStop Server Management Guide

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8-4 OVNPM Fault Tolerance
NonStop Application Manager (NAM) provides OVNPM Fault tolerance. The Fault tolerance must be activated or
deactivated when all OVNPM components are down. NAM manages all OVNPM applications. Once activated
the NAM process will be start at the first sv_start command.
8-4-1 Activating Fault Tolerance
Fault tolerance should be activated after verifying that the OVNPM installation or upgrade is working correctly.
NAM is activated by first enabling it by using the “sv_nam on” command, then restarting OVNPM.
TACL> sv_nam on
The Nonstop Application Managers config is set to ENABLED
Stop and Start OVNPM to ENABLE Nonstop Application Manager
TACL>sv_stop subsys
TACL>sv_start subsys
When OVNPM is running with NAM enabled, the” sv_nam” command without an argument gives the fault
tolerance activation status.
NOTE: NAM requires a fault tolerant home terminal, like $ZHOME. The fault tolerant home terminal was
defined in OVNPM configuration. Refer to Section 3-5 for details.
Only the NAM backup and primary will use that OVNPM home terminal. All other OVNPM processes will use
terminal “$<processPrefix>nam.#term”. NAM primary and backup CPUs are defined in the Host Installation
Client. Refer to Section 3-5 for more details.
For diagnostic purposes, OVNPM process activity is logged in <OVPMLOG>.NAMTLOG.
NAM primary activity is logged in <OVNPMLOG>.NAM<primCpu>LOG.
NAM backup activity is logged in <OVPMLOG>.NAM<backupCpu>lLOG.
8-4-2 Deactivating the Fault Tolerance
Use the sv_nam off command to deactivate fault tolerance.
TACL> sv_nam off
The Nonstop Application Managers config is set to DISABLE
Stop and Start OVNPM to DISABLE Nonstop Application Manager
TACL>sv_stop subsys
TACL>sv_start subsys
NOTE: Since OVNPM AAK release, NAM is enabled by default after the installation.