Next: Warming the cache.
Hummingbird's disk storage is segmented into four regions:
- clusters, which store the file data and meta-data,
- mappings of files to clusters, which allow a file to be quickly
located on disk by identifying which clusters the file is in,
- the hot cluster log, which caches frequently used clusters, and
- the delete log, which stores small records
describing intentional deletes.
The mappings of files to clusters is part of the file meta-data
described in Section 3.2.