Tandem Capacity Model (TCM) Manual

12. #Txns—Not Directly Modifiable
#Txns is the number of transactions per task if a batch transaction. This number can be trended
using the Timeline Trends option of the Update menu.
13. Disk Partitions — Disk partitions are the actual, constrained, and planned partition configuration
for SSD disks. Disk partition specifies if the SSD disk is partitioned or not. If partitioned, it also
specifies the number of partitions. For non SSD disks, this field is NA (not applicable).
Whenever the user selects the SSD model, the value of the disk partition is automatically set
to one, and enables users to select values from 1 to 8.
Significant Columns
14. Txn Name—Modifiable by TCM Administrator
Txn Name is the name of the transactions as shown in the Workload Summary screen of the
Baseline WA model.
15. Rate—Directly Modifiable
Rate is the rate at which planned throughput will grow for each transaction, expressed as
percentages or absolute planning units. You can use these fields to override the value in the
Default Growth Rate field (the value which they initially contain) when the expected transaction
growth rates of some transactions are different from others. This number can be a percentage
or absolute number of transactions. Instead of estimating the growth rate, you can have TCM
use the historical trend. This feature is called throughput trending. For more information, see
“Update Tab” (page 164).
To do throughput trending with the Planning Timeline model:
a. Select Update Timeline Trends.
b. Highlight the transaction to trend and optionally type the start and end dates.
c. Click OK.
The transaction trend is used to update the Planning Timeline screen. If you are using a
color monitor, the trend appears in red.
TCM Parameters Screen
The TCM Parameters screen is used to set parameters for the TCM Performance model. These
parameters can be modified by users with a TCM administrator or superuser authorization level.
Figure 47 (page 148) shows a sample TCM Parameters screen.
TCM Parameters Screen 147