Tandem Capacity Model (TCM) Manual

6. Second Unlabeled Column—Not directly modifiable
The second unlabeled column indicates Aud if the transaction is audited but is left blank
otherwise. A transaction is considered audited if it has a nonzero entry in the TMF process
category in the Apportionment Weights table.
7. # Tasks—Modifiable by the TCM administrator
# Tasks shows the number of tasks on the NonStop host system during the time period of the
sample window. This number applies to batch transactions only.
8. # Txns—Not directly modifiable
# Txns shows the number of transactions on the NonStop host system during the time period
of the sample window. This number is computed according to the user-specified Transaction
Count table, which specifies how to calculate the number of transactions from the number of
messages received, sent or both by the process categories, or is input through the Transaction
Count file. For more information, see “Transaction Count Table” (page 118) and the “Transaction
Count Table Versus Transaction Count File” (page 120).
9. CPU Seconds per Transaction—Not modifiable
CPU Seconds per Transaction is the apportioned number of CPU seconds consumed per
transaction. The Avg On-line row contains the (weighted) average of CPU seconds for each
online transaction. The Avg Batch row contains the (weighted) average of CPU seconds for
each Batch transaction.
The WA model distinguishes between CPU seconds consumed by the various processes of a
transaction, such as the server, requester, disk, TMF, line handler, interrupts, and other
processes.
CPU seconds are apportioned to transactions according to the user-specified Apportionment
Weights table described later in this section. In addition, the disk process component of CPU
seconds is apportioned according to the relative number of disk cache hits and disk cache
misses for each process category.
Disk Read Workload Apportionment Screen
The Disk Read Workload Apportionment screen shows the apportionment of the disk read seconds
consumed by process categories to transactions. Figure 36 (page 110) shows a sample Disk Read
Workload Apportionment screen.
Figure 36 Disk Read Workload Apportionment Screen
Significant Rows
1. Disk Config—Not directly modifiable
Disk Config is the actual disk configuration that was measured for the sample, as determined
by MeasTCM on the NonStop host system. The configuration includes the number of logical
110 Workload Apportionment Model