Running AUTOGEN to Tune the System

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HP OpenVMS Alpha Version 7.3-2 Upgrade and Installation...

After Installing the OpenVMS Alpha Operating System

Configuring a Multihead System

Modifying Parameters

Running AUTOGEN to Tune the System

When you install the OpenVMS Alpha operating system, the system executes the AUTOGEN.COM procedure to set the values of system parameters and the sizes of the page, swap, and dump files according to the system configuration. As a postinstallation procedure, run the AUTOGEN.COM procedure again to properly tune the system.

Run AUTOGEN as follows:

After 24 hours of operation, run AUTOGEN in feedback mode, examine AGEN$PARAMS.REPORT, and reboot the system. To run AUTOGEN in feedback mode, use the following command:
```
$ @SYS$UPDATE:AUTOGEN SAVPARAMS SETPARAMS FEEDBACK
```
To view AGEN$PARAMS.REPORT on your screen, enter the following command and press the Return key:
```
$ TYPE SYS$SYSTEM:AGEN$PARAMS.REPORT
```
You can also print this file or examine it using the EDIT/READ_ONLY command.

If the report includes a message similar to the following, you might need to modify the size of the page, swap, or dump file:
```
%AUTOGEN-W-DSKSPC, The disk on which DKA0:[SYS0.SYSEXE]PAGEFILE.SYS
         resides would be over 95% full if it were modified to hold 20000
         blocks.
```
For more information on AGEN$PARAMS.REPORT, see the OpenVMS System Manager's Manual: Tuning, Monitoring, and Complex Systems.

Run AUTOGEN again in feedback mode two workdays later and examine AGEN$PARAMS.REPORT, and then reboot the system. (For information about the importance of having a current AGEN$FEEDBACK.DAT file, see Ensuring You Have a Recent FEEDBACK.DAT File.)

HP recommends that you run AUTOGEN from the SAVPARAMS phase through the TESTFILES phase weekly thereafter until the system stabilizes (that is, AUTOGEN finds nothing that needs to be adjusted). Make sure you run AUTOGEN when your system is running under a typical work load. Examine AGEN$PARAMS.REPORT to determine the need for additional changes.

If you invoke AUTOGEN without specifying the execution-mode parameter (FEEDBACK, NOFEEDBACK, or CHECK_FEEDBACK), AUTOGEN uses the feedback information in its calculations, but if the feedback information reflects system uptime of less than 24 hours, or if the feedback information is more than 30 days old, AUTOGEN terminates execution. AUTOGEN does not set the parameter settings: this helps prevent you from setting inexpedient values. If you reboot the system, you will see the values are unchanged.

If you specify CHECK_FEEDBACK, and AUTOGEN determines the feedback is suspect, then AUTOGEN ignores the feedback when computing parameter values. It sets the parameter values if you specify the final execution phase as SETPARAMS, SHUTDOWN, or REBOOT. If you wrongly assumed the feedback was valid, the parameter settings might vary significantly from your expectations.

For more information on running AUTOGEN, see the chapter entitled "Managing System Parameters" in the HP OpenVMS System Manager's Manual, Volume 2: Tuning, Monitoring, and Complex Systems.

Configuring a Multihead System

Modifying Parameters