The following LSMS software design features enhance the availability of the LSMS:
The LSMS HA utility monitors the states of both servers, detects failure conditions, and automatically switches over for certain failures on the active server. For more information, see Managing Server States
The Surveillance feature monitors critical processes and interfaces and posts notifications. For more information, see “Understanding the Surveillance Feature”.
The sentryd feature detects certain application failures and automatically attempts to restart the failed applications. Full functionality of this feature requires that the Surveillance feature be enabled. For more information about sentryd, see Restarting Software Processes
The LSMS provides the following automatic attempts to reassociate and resynchronize after outages between NPACs and the LSMS or between the LSMS and network elements (when automatic recovery is not possible, notifications are posted, and operator-initiated recovery procedures are documented as indicated):
Automatic reassociation with an NPAC after some association outages (for operator-initiated recovery procedures, refer to the Configuration Guide)
Automatic resynchronization of NPAC and LSMS data after reassociation (when automatic resynchronization is not possible, notifications are posted, and operator-initiated recovery procedures are documented in “Resynchronizing After an Outage Between an NPAC and the LSMS”)
Automatic resynchronization of the LSMS and network element data after outage (when automatic recovery is not possible, notifications are posted, and operator-initiated recovery procedures are documented in the LNP Database Synchronization User's Guide)