fstrace - Introduction to the fstrace command suite
The commands in the fstrace command suite are the interface that system
administrators employ to trace Cache Manager operations for debugging
purposes. Examples of Cache Manager operations are fetching file data or
the status information used to produce output for the UNIX ls command.
The fstrace command interpreter defines an extensive set of Cache
Manager operations as the "cm"event set. When the event set is
activated, the Cache Manager writes a message to the "cmfx"trace log
in kernel memory each time it performs one of the defined operations. The
log expands only to a defined size (by default, 60 KB), after which it is
overwritten in a circular fashion (new trace messages overwrite the oldest
ones). If an operation of particular interest occurs, the administrator
can afterward display the log on the standard output stream or write it to
a file for later study. For more specific procedural instructions, see the
IBMAFS Administration Guide.
There are several categories of commands in the fstrace command suite:
Commands to administer or display information about the trace log:
fstrace clear, fstrace lslog, fstrace setlog.
Commands to set or display the status of the event set: fstrace lsset
and fstrace setset.
A command to display the contents of the trace log: fstrace dump.
Commands to obtain help: fstrace apropos and fstrace help.
All fstrace commands accept the following optional flag. It is listed
in the command descriptions and described in detail here:
Prints a command's online help message on the standard output stream. Do
not combine this flag with any of the command's other options; when it is
provided, the command interpreter ignores all other options, and only
prints the help message.
To issue most fstrace commands, the issuer must be logged on as the
local superuser "root" on the machine that is generating the trace log.
This documentation is covered by the IBM Public License Version 1.0. It was
converted from HTML to POD by software written by Chas Williams and Russ
Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.