Tandem Capacity Model (TCM) Manual

Figure 16 Workload Apportionment Weights Table
The default Apportionment Weights tables created by TCM provide an excellent starting point for
fine tuning the WA model to your application’s particular architecture. However, to customize the
WA model to best reflect an application’s characteristics, the TCM administrator might need to
modify these tables. The tables also need to be modified if you want to experiment with more than
one apportionment method for your application or if you want to change an existing apportionment
method because of changes in the application’s architecture.
The procedure for modifying a model’s apportionment tables is the same whether you are modifying
the default tables of a new model or changing the tables of an existing model.
To modify the Workload Apportionment Weights table:
1. Open a WA model if one is not already open.
2. Select Options > Change Authorization Level and log on as an administrator or superuser. For
more information about this step, see “Changing Authorization Levels” (page 69).
3. Select Find > Apportionment Weights. If this option is unavailable, select Calculate Now from
the Options tab to update the table. Then select Find > Apportionment Weights. The Workload
Apportionment Weights table appears.
4. Select Options > Unprotect Admin Fields to unprotect the Workload Apportionment Weights
table so you can change its entries. (They are normally protected against modification.)
The entries that you can modify are highlighted.
5. Change the entries in the Apportionment Weights table to best reflect your application’s
characteristics. These entries indicate the relative weights to be assigned to transactions when
the CPU and disk seconds process categories are apportioned.
6. When you are done, select Options > Protect Admin Fields to protect the apportionment tables.
Although this step is optional, it is good practice. It safeguards your data from unintentional
corruption.
7. Select Options > Calculate Now to update the table.
8. If you want to save the file, select Save or Save As under the File tab. See “Saving the Tables”
(page 78).
Modifying the Transaction Count Table
This procedure describes how to modify the default Transaction Count table. The Transaction Count
table tells TCM how to map category message counts to transaction counts. In many cases, you
can derive the number of messages sent or received by a process category or some combination
of categories.
Modifying the Transaction Count Table 77