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  1. Lustre
  2. LU-14459

DNE3: directory auto split during create

    Details

    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Labels:
    • Rank (Obsolete):
      9223372036854775807

      Description

      Directory auto-split should be done when the dir_split_count is hit during file creation to minimize the number of entries that need to be moved, rather than afterward. Otherwise, the entries are being created on a single MDT first, and only being migrated on a later directory access. This is sub-optimal for two reasons:

      • the initial file creation will be limited to a single MDT and not distribute the load across multiple MDTs, so just entry migration will still leave all the inodes on the original MDT
      • the post-creation migration will need to move many more files/entries to the other MDTs than if the files are created on the correct MDT to start with

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              • Assignee:
                laisiyao Lai Siyao
                Reporter:
                adilger Andreas Dilger
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                Dates

                • Created:
                  Updated: