1. 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:
$ TYPE SYS$SYSTEM:AGEN$PARAMS.REPORT
You can 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 about AGEN$PARAMS.REPORT, see the HP OpenVMS System
Manager's Manual, Volume 2: Tuning, Monitoring, and Complex Systems.
2. Run AUTOGEN again in feedback mode two work days later and examine
AGEN$PARAMS.REPORT, and then reboot the system. (For information about the
importance of having a current AGEN$FEEDBACK.DAT file, see Section 4.8 (page 91).)
3. HP recommends that you run AUTOGEN from the SAVPARAMS phase through the
TESTFILES phase weekly thereafter until the system stabilizes (that is, until AUTOGEN
finds nothing that needs to be adjusted). Make sure you run AUTOGEN when your system
is running under a typical workload. Examine AGEN$PARAMS.REPORT to determine the
need for additional changes.
IMPORTANT: If you start AUTOGEN without specifying the execution-mode parameter
(FEEDBACK, NOFEEDBACK, or CHECK_FEEDBACK), AUTOGEN uses the feedback
information in its calculations. However, if the feedback information reflects system up time
of less than 24 hours, or if the feedback information is more than 30 days old, AUTOGEN
includes warnings in the AGEN$PARAMS.REPORT file to alert you to potential problems
with the feedback data. If you wrongly assume the feedback is valid, the parameter settings
might vary significantly from your expectations.
If you specify FEEDBACK (or NOFEEDBACK), AUTOGEN uses (or does not use) the
feedback regardless of the data’s reliability. AUTOGEN proceeds through the SETPARAMS
phase (if you specified SETPARAMS, SHUTDOWN, or REBOOT as the end phase) and sets
system parameters to the values it computed.
If you specify CHECK_FEEDBACK, AUTOGEN checks the validity of the feedback data. If
AUTOGEN determines the feedback is suspect, then AUTOGEN ignores the feedback when
computing parameter values. It stops at the TESTFILES phase and issues a warning in the
report that parameters have not been changed. You must read the report and decide whether
the calculated values are acceptable. You can either use them (by running the AUTOGEN
SETPARAMS phase) or rerun AUTOGEN with valid feedback data.
4. After the system has stabilized, HP recommends that you run AUTOGEN at least monthly
to save feedback information for future use. Use the following command:
$ @SYS$UPDATE:AUTOGEN SAVPARAMS
If you do not maintain current feedback information for AUTOGEN, you will not have the
needed information the next time you upgrade your system. As a result, you may have to
reboot and rerun AUTOGEN several times to make your upgraded system operational.
For more information about running AUTOGEN, see the HP OpenVMS System Manager's Manual,
Volume 2: Tuning, Monitoring, and Complex Systems.
7.24 Running AUTOGEN to Tune the System 163
