DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Architecture
1-19SPE Duplication
1
■ If the two SPEs have different SOH, the SPE with the better SOH becomes
or remains the active SPE.
These descriptions apply to SOH levels on the standby SPE. Four possible levels
of SPE SOH are supported and maintained by system hardware and software.
Standby SPE Maintenance Architecture
The maintenance strategy for the standby SPE is based on several independent
components.
■ Maintenance of handshake communication so that software on the active
SPE can control maintenance of the standby SPE and its components.
■ Controlling memory shadowing and performing the standby memory
refresh operation.
■ Activities, independent of handshake communication and memory
shadowing, used to allow tracking of the standby SPE’s condition. This
includes reading of hardware status to determine the actual state of
standby SPE.
functional The standby SPE is fully healthy with up-to-date
memory content identical to active SPE memory
content. An interchange into this SPE will cause minimal
service disruption.
not refreshed The standby SPE’s hardware and operational software
are fully healthy but the standby memory content is not
currently identical to active SPE memory content.
Typically either memory shadowing is off or a memory
refresh operation is in progress to bring the memories’
contents into agreement. Interchange into an SPE of
this health level will lead to calls dropping and a service
outage of several minutes.
partially-functional One of the following conditions is in effect:
— A failure of a critical standby SPE component has
occurred.
— The standby SPE has been busied out.
— The SPE is in recent interchange mode (see
‘‘STBY-SPE (Standby SPE Maintenance)’’
in
Chapter 9, ‘‘Maintenance Object Repair
Procedures’’).
non-functional This is the worst and most seriously disabled state of a
standby SPE. The SPE has lost either power or basic
sanity; the standby processor and its software are
unable to cycle. Such an SPE cannot be made active
by an interchange.
