Details
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Improvement
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Resolution: Unresolved
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Minor
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None
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Lustre 2.12.0
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9223372036854775807
Description
Shrinking directories in ldiskfs would be desirable for cases where a directory had a large number of files created, but the files are deleted and the directory is empty and could be deallocated.
There is a patch submitted to upstream ext4 that is the start of the support for this functionality, but it is not very aggressive about removing directory blocks: https://patchwork.ozlabs.org/patch/1048658/
There is intended to be additional work in this area to improve the directory shrinking functionality.
In addition to the directory shrinking, removal of old OST object directory trees (O/*/d*) is also useful, and could potentially be a substitute for having online directory shrink once the directories are completely empty.
