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Classroom Contents
Faster and Smaller qcow2 Files With Subcluster-based Allocation
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- 1 Intro
- 2 The qcow2 file format
- 3 Structure of a qcow2 file
- 4 copy-on-write means more I/O
- 5 copy-on-write means more used space
- 6 Decreasing the cluster size
- 7 Smaller clusters mean more metadata
- 8 The L1 table
- 9 L2 metadata size
- 10 Accessing L2 metadata
- 11 Reference counts
- 12 The overhead of having to allocate clusters
- 13 The situation so far
- 14 Subcluster allocation: what it looks like
- 15 L2 tables in details
- 16 Extended L2 entries
- 17 Two use cases for subcluster allocation
- 18 less copy-on-write means faster I/O
- 19 less copy-on-write means less used space
- 20 larger clusters mean less metadata
- 21 Implementation status
- 22 Acknowledgments
