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.