In the last chapter, we were concerned primarily with introducing you to the Advanced File System (AdvFS) and its commands. Our discussion of the new concepts should provide you with enough information to be successful with most of the tasks you will encounter in the day-to-day administration of this powerful file system. This chapter is intended to move you to the next level of understanding by introducing some advanced topics in AdvFS. We begin by discussing troubleshooting, including the theory behind on-disk structures, file tags, metadata, and the tools used for recovering from file system corruption. Then, we move on to techniques and tools for monitoring and tuning your AdvFS.