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1
Satellite
2-4-2. Shared check tracking requirement
2-4-3. Data backup when the master goes down
QT-6600 Reference Manual
4
Backup
master
Check
tracking
2 5
3
Shared check tracking processing in one cluster is performed as shown in the figure shown
above.
1 A shared check operation (such as "new check" or "old check" etc.) is made at a
terminal.
2 The terminal sends the check number to the check tracking master and the backup
master. The master and backup master turn on the busy status.
3 The master sends back the check data (if the check number exists) or opens a new check
number.
4 A shared check transaction is finalized (by "new balance" or other finalize key).
5 The terminal sends the check data to the master and the backup master. And the master/
backup master clears the busy status of the check number.
The following definition of memory allocation is required in each terminal before you can
perform shared check tracking.
• Number of check tracking tables:
For satellite, minimum one, for master, more than the number of estimated open checks
*
should be defined.
*
In case of using the next block
• Number of items/tables (per one item block
This is not the maximum number of items or functions but the number ordinarily
registered items or functions per one table. If the number of items or functions exceeds
this value during registration, the next block is used automatically for the following
transactions.
**
Number of item blocks:
Ordinarily, the registration requires one item blocks—but in a party for example—more
items are registered per one table. So it is necessary to define how many item blocks can
be used.
The maximum number of items or functions per one check is defined by the formula:
= (Number of items / tables) × (Number of item blocks (1 ~ 10))
When memory near end and memory end happens during registration, an error occurs.
See section A-5. Error messages of this manual.
When the system has the backup master for the check tracking system, registered check
tracking data are stored both master and backup master automatically.
As soon as the system detects master down, the backup master roles as master for the check
tracking system.
(It is necessary to switch to backup master manually. See the "System down & Recovery"
chapter on page 9 of the installation & down recovery manual.)
When the system has no backup master for the check tracking system or both master and
backup master become down, no more check tracking operation and clerk interrupt
operation can be made.
Master
Check
tracking
**
, one more check tracking table is consumed.
**
):
R-45
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