Tandem Capacity Model (TCM) Manual

Modify the Avg Batch Resp Time Constraint field if you want TCM to estimate the number of CPUs
and disks required to ensure that average batch response time does not exceed the constraint,
and that all other constraints are also met. For example, if the average batch response time should
not exceed five minutes, enter one of the following in this field:
0h5m
5m
The syntax for the Avg Batch Resp Time is:
[ number h ] [ number m ] [ number s]
number
is any nonnegative integer; for example, 0, 1, or 45.
h
specifies hours.
m
specifies minutes.
s
specifies seconds.
Planning Timeline Model
The Planning Timeline model shows the number of transactions per task for batch transactions
(instead of throughput for online transactions) and average response time for the task. Figure 33
(page 104) shows a sample Planning Timeline model screen.
Figure 33 Planning Timeline Model Screen
Calibrating Batch Response Time
If you observe the actual response time of batch transactions that you run on your system and want
TCM to adjust its predicted response time accordingly, you can use the Calibrate Batch Response
Time option. Any TCM user can perform this function, regardless of security level.
104 Modeling Batch Workloads