NAME

       o2hbmonitor - Monitors disk heartbeat in the O2CB cluster stack

SYNOPSIS

       o2hbmonitor [-w percent] [-ivV]

DESCRIPTION

       o2hbmonitor  is  a  utility  to  monitor  the disk heartbeat in the o2cb cluster stack. It
       tracks the time elapsed since the last heartbeat and logs messages  once  it  exceeds  the
       warn threshold.

       By  default, it runs as a daemon and logs messages to the system logger. It can be started
       at any time and stopped using kill(1). It does not affect the functioning of the heartbeat
       thread.  It  is  typically  automatically started during cluster online and stopped during
       cluster offline by the o2cb init script.

       This utility expects the debugfs file system to be mounted at /sys/kernel/debug.

OPTIONS

       -w percent
              Warn threshold percent. It is the percentage of the idle threshold. It defaults  to
              50%.

       -i     Interactive mode. It works as a daemon by default. This mode is typically only used
              for debugging.

       -v     Verbose mode. It logs messages only to the system logger by default. In  this  mode
              it also logs the messages to stdout.

       -V     Displays version.

NOTES

       This utility works with Linux kernel 2.6.37 and later.

SEE ALSO

       o2cb(7)

AUTHORS

       Oracle Corporation

COPYRIGHT

       Copyright © 2010, 2012 Oracle. All rights reserved.