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Type:
Improvement
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Status: Resolved
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Priority:
Minor
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: Lustre 2.14.0
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Labels:
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Rank (Obsolete):9223372036854775807
during Lustre server startup few small files need to be updated (e.g. config backup).
at this point buddy/bitmap cache is empty but mballoc wants to find a big chunk of free space for group preallocation and reads bitmaps one by one.
sometimes this can take a very long time.
one possisble workaround is to disable preallocation during mount.
a long term plan is to limit scanning and prefetch bitmaps, but this needs more efforts and will be tracked separately (LU-12970)