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E-Series and IBM GPFS cluster have performance issue

Applies to

  • NetApp E-Series
  • GPFS Cluster
  • Linux DM-MP (Kernel 3.9 or earlier)

Issue

  • Two LUN's causing extreme performance degradation across the IBM GPFS cluster
  • Controller A had multiple exceptions (panic/crash) every time the LUN's were brought back in to the cluster
  • A side effect of this situation was also an error volume not on preferred path ( VNOPP )

 

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