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#------------------------------------------------------------------------------
# cmdebug.pod
#
# Copyright © 2004 Alf Wachsmann <alfw@slac.stanford.edu> and
#                  Elizabeth Cassell <e_a_c@mailsnare.net>
#
# This library is free software; you can redistribute it and/or modify it
# under the same terms as Perl itself.
#------------------------------------------------------------------------------

=head1 NAME

B<cmdebug> - Reports status of cache manager and cache entries on a particular AFS client machine.

=head1 SYNOPSIS

  use AFS::Monitor qw(cmdebug);

  my ($locks, $cache_entries) =
      cmdebug(server => "hostName",
              port   => 7001,
              long   => 1
             );

=head1 DESCRIPTION

The B<cmdebug> function can be used to examine the status of the
cache manager and cache entries on a particular AFS client machine.
This function is useful when you suspect that the cache manager is
hung, or is performing poorly.

=head1 OPTIONS

=over

=item B<server>

Names the client machine to examine.

=item B<port>

This switch is only useful with port 7001 since that is the
callback port.

=item B<long>

This switch will display the status of all of the cache entries
on the AFS client when there are no problems.

=back

As a first step in diagnosing a problem, run B<cmdebug> without the
B<long> switch. A machine running in a normal state (i.e. not
experiencing any problems), may display some locks set, but these
locks should not be continually set over multiple B<cmdebug>s. If the
functions returns with no output, it simply means there is nothing
to report.

=head1 OUTPUT

The return values are references to two arrays.
Each entry in the first array represents the status of the cache manager's data
structures. Each entry in the second array represents an individual cache entry.

=head1 AUTHORS

The code and documentation for this class were contributed by Stanford
Linear Accelerator Center, a department of Stanford University.  This
documentation was written by

=over

=item Elizabeth Cassell <e_a_c@mailsnare.net> and

=item Alf Wachsmann <alfw@slac.stanford.edu>

=back

=head1 COPYRIGHT AND DISCLAIMER

 Copyright 2004 Alf Wachsmann <alfw@slac.stanford.edu> and
                Elizabeth Cassell <e_a_c@mailsnare.net>
 All rights reserved.

 Most of the explanations in this document are taken from the original
 AFS documentation.

 AFS-3 Programmer's Reference:
 Volume Server/Volume Location Server Interface
 Edward R. Zayas
 (c) 1991 Transarc Corporation.
 All rights reserved.

 IBM AFS Administration Reference
 (c) IBM Corporation 2000.
 All rights reserved.

 This library is free software; you can redistribute it and/or modify it
 under the same terms as Perl itself.