Tandem Capacity Model (TCM) Manual

6. When you are done, select Options > Protect Admin Fields to protect the apportionment tables.
Although this step is optional, it is good practice because it safeguards your data from
unintentional corruption.
7. Select Options > Calculate Now (F12) to update the table.
8. If you want to save the file, choose Save or Save As from the File tab.
For more information, see “Modifying the Transaction Count Table” (page 77).
Modifying the 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 change an existing apportionment method due
to 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 the tables of an existing model.
To modify the Workload Apportionment Weights table:
1. Open a WA model.
2. Log on as an administrator or super user
3. Select Find > Apportionment Weights. If this menu item is unavailable, select Options > Calculate
Now (F12) 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.)
TCM highlights the fields that you can modify.
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 because it safeguards your data from
unintentional corruption.
7. Select Options > Calculate Now (F12) to update the table.
8. If you want to save the file, select Save or Save As from the File tab.
Moving Between Screens
To move between screens within TCM, select the name of the screen you want to view from the
Find menu, or select from the Screen tabs at the bottom.
Picking the Best CSV Sample and Loading It Into the Performance Model
You can have TCM Expert pick the most representative CSV file and load it into the Performance
model.
To pick the best CSV sample and load it into the Performance model:
1. From the “TCM Initial Menu” (page 66), select TCM Expert and click OK.
The Specify Custom Directory dialog box appears.
2. Specify the custom folder location of your CSV files.
Select the custom folder of your CSV files and double-click the custom folder name. When you
double-click the name, TCM updates this name in the custom folder field of the dialog box
and also makes this folder the location of your working session.
3. Click OK to close the dialog.
4. Select TCM Expert > Pick Best CSV Sample.
The Pick Best CSV Sample dialog box appears.
244 Common TCM Procedures