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By Federico Biancuzzi
May 18, 2009

WAPBL stands for "Write Ahead Physical Block Logging". WAPBL provides metadata journaling for file systems. In particular, it is used with the fast file system (FFS) to provide rapid file system recovery after a system outage. It also provides better general-use performance over regular FFS through less on-disk metadata updates - these are coalesced in the journal. WAPBL was developed by Wasabi Systems, and recently Wasabi contributed that work back to NetBSD. Wasabi has been using WAPBL in its storage products for about four or five years now.

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