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  1. Lustre
  2. LU-15850

MDT QOS should always be used for round-robin directories.

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    • Icon: Improvement Improvement
    • Resolution: Fixed
    • Icon: Minor Minor
    • Lustre 2.16.0
    • Lustre 2.15.0
    • 9223372036854775807

      The MDT QOS should always be used for subdirectories created in a parent that has round-robin activated, if the MDT space balance exceeds qos_threshold_rr. Otherwise, subdirectories in that directory tree will suddenly change from r-r to being "sticky" on a single MDT, which significantly changed the behavior and load distribution across MDTs. The "threshold by depth" should only be used for directories that would otherwise have always been created on the parent already.

      Related to this, it should be possible to tune the weighting of subdirectories by depth so that this can be adjusted without recompiling the code.

            laisiyao Lai Siyao
            adilger Andreas Dilger
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