.TH "o2hbmonitor" "8" "January 2012" "Version 1.8.7" "OCFS2 Manual Pages"
.SH "NAME"
o2hbmonitor \- Monitors disk heartbeat in the O2CB cluster stack
.SH "SYNOPSIS"
\fBo2hbmonitor\fR [\fB\-w\fR percent] [\fB\-ivV\fR]
.SH "DESCRIPTION"
.PP 
\fBo2hbmonitor\fR is a utility to monitor the disk heartbeat in the \fBo2cb\fR
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 \fBkill(1)\fR. 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 \fIo2cb\fR init script.

This utility expects the \fBdebugfs\fR file system to be mounted at \fB/sys/kernel/debug\fR.

.SH "OPTIONS"
.TP
\fB\-w\fR percent
Warn threshold percent. It is the percentage of the idle threshold. It defaults to 50%.

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

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

.TP
\fB\-V\fR
Displays version.

.SH "NOTES"
This utility works with Linux kernel \fB2.6.37\fR and later.

.SH "SEE ALSO"
.BR o2cb(7)

.SH "AUTHORS"
Oracle Corporation

.SH "COPYRIGHT"
Copyright \(co 2010, 2012 Oracle. All rights reserved.