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18. DISK TRICKS WITH GEOM

Chapter 18. DISK TRICKS WITH GEOM

DISK TRICKS WITH GEOM

FreeBSD has an incredibly flexible disk management system called GEOM. GEOM is an infrastructure system that allows kernel developers to easily program modules, called GEOM classes, for different types of disk functionality. FreeBSD uses GEOM to support disk encryption, journaling, several different types of software RAID, and exporting disk devices across the network. The GEOM tools provide flexibility, redundancy, and ease of implementation for both developers and system administrators. We’ll take you through FreeBSD’s disk partitioning tools and then cover several of the popular GEOM classes.

Throughout this chapter, we’ll experiment with disk devices. Any time you touch a disk’s layout or format, you risk the data on that disk. While it’s entirely possible to manipulate unused disk space without affecting data on the rest of the disk, learning how to do that is still risky. Back up your data. Better still, find an unused disk and learn on it! (On the other hand, learning on the disk that contains your most precious data will nicely focus your mind.)


  

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