What is the difference between "noac" and "actimeo=0" NFS mount options?

Solution Verified - Updated -

Issue

  • What is the difference between the "noac" and "actimeo=0" NFS mount options?
  • Our NFS performance suffers when using "noac", but performs quite well with "actimeo=0", why is this?
  • Is NFS attribute caching broken in RHEL as per the upstream kernel commit b0b539?

Environment

  • Red Hat Enterprise Linux 5
  • NFS client

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