Large Dentry Cache Growth in Containerized OpenStack

Solution Verified - Updated -

Issue

  • A large dentry cache growth is seen on OpenStack controller nodes
  • The large growth may negatively effect the system performance when it reclaims the cache
  • Controller freezes for 30 to 60 seconds, while reclaiming the cache and sometimes causing fence event to the node

Environment

  • Red Hat OpenStack Platform 13 (all minor releases prior to z6)

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