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 h ave d iffere nt SOH, the SPE wi th th e bett er SOH bec omes
or rem ains t he ac tive SPE.
These d esc ript ions a ppl y to SOH leve ls on th e sta ndb y SPE. Four poss ible level s
of SPE SOH a re sup por ted a nd ma intai ned b y sy stem h ardwa re and soft ware.
Standby SPE Maintenance Architecture
The maintenance strategy for the standby SPE is based on several independent
components.
■Maintenance of handshake c ommunication so that software on the active
SPE can c ontr ol mai ntena nce o f the s tand by SPE an d its comp onen ts.
■Controlling memory shadowing and performing the standby memory
refresh operation.
■Activities, independ ent of handshake communic ation and memory
shadowing, used to allow trac king of the standb y SPE’s condition. This
includes reading of hardware status to determine the ac tual state of
standby SPE.
func tiona l The sta ndb y SPE is fu lly h ealth y with up-t o-da te
memory content identical to active SPE memory
content. An interchange into this SPE will cause minimal
service disruption.
not re fresh ed The sta ndb y SPE’s ha rdw are an d op erati onal s oftwa re
are fully healthy but the standb y memory content is not
curr ently iden tica l to ac tive SPE memor y co ntent .
Typically either memory shadowing is off or a memory
refresh operation is in prog ress to bring the memories’
contents into agreement. Interchang e into an SPE of
this health level will lead to calls d ropping and a service
outage of several minutes.
partially-functional One of the following conditi ons is in effect:
— A failure of a critical stand by 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 disab led state of a
stand by SPE. The SPE has lost e ithe r pow er or b asic
sanity; the standby proc essor and its software are
unable to cycle. Such an SPE cannot be mad e active
by an interchange.