Problem Determination Aid log data set size work sheet for short-term trace history

Use the work sheet to calculate the size of your PDA log data set (short term).

Fill in the blanks with values for your installation.

 
________  =  ?tracehours   -  The number of hours of trace history
                              you want to retain.
________  =  ?UID          -  The high-level qualifier you want to
                              use for the PDA log data sets.
________  =  ?HOSTID       -  The identifier for the processing unit
                              at your site.
________  =  ?TRACEUNIT    -  The unit identifier for the device on
                              which you want to allocate the PDA log
                              data sets.
________  =  ?TRACEVOL     -  The serial number for the volume on
                              which you want to put your PDA log
                              data sets.

Allocate the minimum recommended storage for PDA log data sets, which is 20 cylinders.
Substitute the values you used in step 1 of this work sheet, and run the JCL job shown in Figure 1 to allocate and catalog the PDA log data sets.
Figure 1. JCL for allocating and cataloging PDA log data sets
```
//ALLOPDO JOB MSGLEVEL=1,TYPRUN=HOLD
//STEP1   EXEC PGM=IEFBR14
//DD1     DD DSN=?UID..?HOSTID..RMMPDOX,DISP=(,CATLG),
//           UNIT=?TRACEUNIT.,VOL=SER=?TRACEVOL.,SPACE=(CYL,(20))
//DD2     DD DSN=?UID..?HOSTID..RMMPDOY,DISP=(,CATLG),
//           UNIT=?TRACEUNIT.,VOL=SER=?TRACEVOL.,SPACE=(CYL,(20))
```
If you have allocated these data sets as SMS-managed, they must be allocated on a specific volume and they must be associated with a storage class having the GUARANTEED SPACE attribute.
Measure the cylinders per hour trace history generation rate at your site.
After one hour of processing (during a time of high DFSMSrmm activity), measure the amount of storage used to record that hour's trace activity. Issue the MODIFY command to swap the EDGPDOX and EDGPDOY data sets. After you have swapped these data sets, the EDGPDOY data set will be ready to measure and the EDGPDOX data set will be ready to receive additional trace data.
```
F DFRMM,PDALOG=SWAP
```
Use the information gathered in this step to calculate the cylinders per hour.
```
Cylinders/hr = cylinders per hour of trace history
```

Calculate the total amount of cylinders required for your site's trace history data.

((tracehours = ________) x (cylinders/hr = ________))  =  ________
 
  Total = total number of cylinders of trace data

Divide in half the total cylinders required for your short-term trace history interval. If the result is a fraction, round up to the next whole number.
```
       (Total =       )      =  ________
       ---------------
              2
```
This step provides the total number of cylinders to allocate for each data set.