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IBM System Storage N series Software Guide by Marco Schwarz, Tom Provost, Steven Pemberton, Dirk Peitzmann, Jeff Lin, Roland Tretau

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Write Anywhere File Layout
This chapter describes Write Anywhere File Layout (WAFL), which is a file system designed specifically to work in a file server appliance. Our primary focus in this chapter is on the algorithms and data structures that WAFL uses to perform its I/O and to implement Snapshots (read-only clones of the active file system). WAFL uses a unique copy-on-write technique to minimize the disk space that Snapshots consume. This chapter ...

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