I haven't had to use this too often but I've had a few occasions where I had to troubleshoot timing issues in the boot process. Mainly where a service tries to start before the disks are available. We suspected that an fsck was stopping the filesystem from being mounted but the service was started anyways.
In order to test our theories we had to force a fsck on reboot.
# touch /forcefsck
Recently Benjamin published his first book; Red Hat Enterprise Linux Troubleshooting Guide. In addition to writing, he has several Open Source projects focused on making Ops easier. These projects include Automatron, a project enabling auto-healing infrastructure for the masses.
Identify, capture and resolve common issues faced by Red Hat Enterprise Linux administrators using best practices and advanced troubleshooting techniques
What people are saying:
Excellent, excellent resource for practical guidance on how to troubleshoot a wide variety of problems on Red Hat Linux. I particularly enjoyed how the author made sure to provide solid background and practical examples. I have a lot of experience on Red Hat but still came away with some great practical tools to add to my toolkit. - Amazon Review