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 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
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 OpenAFS
There are several categories of commands in the fstrace
- Commands to administer or display information about the
trace log: fstrace clear, fstrace lslog, and fstrace
- 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:
- Commands to obtain help: fstrace apropos and
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.
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