Periodic performance degradation. Kswapd seen in 'D' state.

Solution Verified - Updated -

Issue

  • Periodically performance degradation (slow interactive response, job throughput taking longer than normal) is experienced. These episodes sometimes last for hours, then the performance gradually recovers to "normal".
  • During these slowdowns, kswpad is frequently in 'D' state.

Environment

  • Red Hat Enterprise Linux 5
  • Veritas filesystem

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