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View Code? Open in Web Editor NEWDeveloper documentation, btrfsinternals.
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(de)fragmentation doc
A doc that helps application developers manage fragmentation:
- estimating fragmentation
- limitations of FIEMAP (filefrag)
- effect of compression on real fragmentation vs as reported by FIEMAP
- avoidance strategies
- nodatacow, pros/cons
- fallocate, pros/cons
- create a subvolume in lieu of an enclosing directory for the files? helps avoid inadvertent snapshots from above
- submitting files for periodic defragmentation
- BTRFS_IOC_DEFRAG vs BTRFS_IOC_DEFRAG_RANGE (should libbtrfsutil expose a preferred usage?)
- autodefrag by xattr pros/cons (future feature)
- effect of defrag on reflinked files; e.g. defrag is not snapshot aware
- estimating the cost/benefit of defragmenting (latency?)
- misc/appendix
- effect of nossd, ssd, ssd_spread on fragmentation and defragmentation
- kinds of fragmentation: free space, metadata, data
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