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Reliability Systems: A Maintenance Aid
555-233-123 6-12 Issue 4 May 2002
This means that all of Active SPE DRAM Memory is shadowed over into Standby
SPE Memory. The refresh is necessary because, while in Maintenance Mode,
memory shadowing to the Standby SPE is disabled, and Standby SPE Memory is
not updated to reflect changes in Active SPE Memory. After the refresh, Standby
SPE Memory is again an up-to-date reflection of Active SPE Memory.
The Standby SPE goes into Down Mode when certain error conditions are
detected. These error conditions are described in detail in the “Hardware Error
Log Entries and Test to Clear Values” section of STBY-SPE (Standby SPE)
Maintenance documentation in
Chapter 10, ‘‘Maintenance Object Repair
Procedures’’ . Once the error condition(s) that caused the Standby SPE to go into
Down Mode is (are) corrected, the Standby SPE is first put into Maintenance
Mode to conduct testing on Standby SPE components and is then returned to
Standby Mode.
Use status system to determine the current mode of the Standby SPE.
SPE-Interchanges
The process by which the Standby SPE takes over for the Active SPE is referred
to as an SPE-interchange. There are six conditions under which an
SPE-interchange is initiated:
■
Upgrade Software
Type upgrade software to upgrade the software on a High or Critical
Reliability system, reboot the Standby SPE from the standby translation
card, and invoke an SPE-interchange so that the system is running on new
software.
■
System Technician Command
Type reset system interchange on the G3MT terminal to initiate an
SPE-interchange.
■
Alarm Condition
If a Major or Minor alarm is activated on any circuit pack, an
SPE-interchange is initiated, provided the health of the Standby SPE is
better than that of the Active SPE.
Table 6-2 on page 6-14 lists the MOs,
the alarm levels, the level of SPE-interchange initiated, and the severity
given to the alarm for all MOs that can cause software requested
SPE-interchanges. The health of an SPE is based upon the single most
severe alarm active within that SPE. The higher the severity level, the more
severe the problem. The restart level of the interchange also depends on
the single most severe alarm within the active SPE. Hot Restarts occur
only when the Standby SPE is in standby mode. For example, the active
SPE has a MAJOR SHDW-CIR and a MINOR DATA-BD alarm, and the
standby SPE has a MAJOR TAPE alarm. In this case, the severity level of
the active is 60, the severity level of the standby is 65, and no
SPE-interchange would occur.