Before upgrading your system, HP recommends that
you have a recent AGEN$FEEDBACK.DAT file. This file is in SYS$SPECIFIC:[SYSEXE]
(that is, in [SYSx.SYSEXE], where x is the root; for example, SYS0 or SYS1). In OpenVMS Cluster systems,
this file should exist in each node’s SYS$SPECIFIC directory.
When the system (or each system in a cluster) is rebooted after the
upgrade, AUTOGEN runs. If a recent AGEN$FEEDBACK.DAT file is available,
it is used. The data in this file helps AUTOGEN set system parameters
for your specific applications and workload.
|NOTE: If you do not have a current AGEN$FEEDBACK.DAT
file, AUTOGEN might calculate system parameters that do not reflect
your system's requirements. In that case, multiple cycles of
running AUTOGEN and rebooting might be necessary before all layered
products can be started. In some cases, successful startup can require
additional entries in MODPARAMS.DAT. This should not be necessary
if a current AGEN$FEEDBACK.DAT file is available.|
If you do not have the AGEN$FEEDBACK.DAT file
on your system, HP recommends that you create a current AGEN$FEEDBACK.DAT
file during a time when your system is running under a typical workload.
To ensure the greatest data reliability, the system should be running
for more than 24 hours but less than 30 days. Enter the following
$ RUN SYS$SYSTEM:AGEN$FEEDBACK.EXE
This runs very quickly and should not affect the
performance of your system while it executes.
You can also specify the SAVE_FEEDBACK option
when you execute the SYS$SYSTEM:SHUTDOWN.COM procedure; however,
the data captured might not fully reflect the typical workload on
|IMPORTANT: If you start AUTOGEN without specifying the execution-mode
parameter (FEEDBACK, NOFEEDBACK, or CHECK_FEEDBACK), AUTOGEN uses
the feedback information in its calculations. However, if the feedback
information reflects system up time of less than 24 hours, or if the
feedback information is more than 30 days old, AUTOGEN includes warnings
in the AGEN$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.