---
name: "o2hbmonitor"
section: "8"
platform: "linux"
package: "ocfs2-tools"
version: "1.8.8-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/o2hbmonitor"
---

# o2hbmonitor(8)

Monitors disk heartbeat in the O2CB cluster stack

## 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)](/kill/1.md)**. 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)](/o2cb/7.md)**

## AUTHORS

Oracle Corporation

## COPYRIGHT

Copyright © 2010, 2012 Oracle. All rights reserved.