Tandem Capacity Model (TCM) Manual

• “Returning to TCM From a Chart” (page 245)
• “Running MeasTCM” (page 245)
• “Saving Apportionment Tables” (page 246)
• “Saving a Performance Model” (page 246)
• “Saving a Workload Apportionment Model” (page 247)
• “Sorting Capacity History Data” (page 247)
• “Uncalibrating Batch Response Time” (page 248)
• “Updating the Capacity History Database” (page 248)
• “Updating the Capacity History Database With Selected CSV Files” (page 248)
• “Using Online Help” (page 249)
• “Using TCM Expert to Generate an Apportionment Weights Table for CSV Files” (page 249)
• “Using the Consumption Model” (page 250)
• “Using the Process Category Audit (PCAT) Report” (page 251)
• “Using the Planning Timeline Model” (page 251)
• “Viewing TCM Expert Parameters” (page 252)
Adding a Transaction
The Add Transaction option adds a new, user-defined transaction to the Performance model that
typically was not apportioned using a WA model. For example, if you have estimates of CPU and
disk demands for a new transaction for which no Measure data yet exists, you can use this option
to define the transaction.
To add a transaction:
1. Log on as an administrator or a super user.
2. Open a Performance model.
3. Select Update > Add Transaction. The Add Transaction dialog box appears.
4. In the Add Transaction section, select the Transaction Name, Type, Transactions per Second,
and Transaction Priority.
5. In the CPU Secs per Txn section, select the Interrupt CPU Secs per Txn, Application CPU Secs
per Txn, and Disk Process CPU Secs per Txn.
6. In the Application Disk Seconds section, select Read Secs per Txn and Write Secs per Txn.
7. If the transaction is audited, click the Audited check box. If the transaction is not audited, leave
the check box unchecked. If the transaction is audited, TCM assigns default values to the TMF
disk read and write seconds for the transactions.
8. Click Add.
The transaction’s activity is allocated entirely to a category of the same name and is added to both
the actual and plan baseline screens.
To examine or modify these values, select Update > Change Transaction.
For more information, see “Add Transaction” (page 171) and “Add Similar Transaction” (page 172).
Analyzing Capacity History
The Capacity History database is a valuable tool in determining the reasonableness of the
apportionment method. From it, the capacity planner can:
• analyze the apportioned data in each sample model and eliminate unrepresentative sample
models
• identify the apportionment method that yields the most consistent CPU demands
To analyze capacity history:
Adding a Transaction 231