Muhammad Umer (RHCA®) is a systems engineer and trainer with more than six years of experience in working with Linux based systems, HA design & architecture, tuning operating system and underlying hardware for optimal performance and root cause analysis. Ever since a virus infected his laptop ten years ago, he switched to Linux. Turns out, it wasn’t the worst thing that ever happened. He has a particular preference for all things storage and in this book, he has tried to decode the mysteries of the Linux storage stack one disk sector at a time. When not immersed in the binary wonders of storage, you can find him savoring pizza and dreaming of a world where storage is as reliable as a perfectly timed cron job.