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  1. Lustre
  2. LU-12988

improve mount time on huge ldiskfs filesystem

    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: Lustre 2.14.0
    • Labels:
    • Rank (Obsolete):
      9223372036854775807

      Description

      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)

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              • Assignee:
                bzzz Alex Zhuravlev
                Reporter:
                bzzz Alex Zhuravlev
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                Dates

                • Created:
                  Updated:
                  Resolved: