System Down And Recovery - Casio QT-2100 Installation & Down Recovery Manual

2. System down and recovery

QT-2100 Installation & Down Recovery Manual
In the QT-2100 system, the check tracking system has their master and backup master and
remote printer printing system has their master printer and backup master printer. If both
masters (or corresponding printers) go down, the check tracking system, and remote printer
printing system cannot continue any processing. Therefore, the system must be designed
such that even if the master goes down, their processing remains unaffected. The QT-2100
system whose master and backup master, respectively, have files for above systems
simultaneously updates their counter/totalizer/work area during operations. If the master
goes down, control is automatically transferred (only the remote printer printing system)/
the control is manually transferred (check tracking system) to the backup master,
preventing their operation from being interrupted.
Nevertheless, system reliability should be improved so as to minimize the possibility of
system failure. Poor system reliability disables the system to work efficiently. System
reliability could be improved by the following method.
1) Use reliable system components.
2) Design reliable circuitry.
3) Make sure that trouble with the system can be remedied easily.
4) Provide complete backup to minimize damage caused by trouble.
Item 1) and 2) are concerned with hardware design. Needless to say, they were given the
utmost consideration in designing the QT-2100 system. Item 3) is related to software
design. As an effective solution to these problems, the QT-2100 offers a diagnostic routine
and backup functions.
This section describes the measures provided by the system to prevent trouble, the system
function performed when the system goes down, and the method of system recovery.
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