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Write latency increases after reinsertion of E5700 controller

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Applies to

  • NetApp E-Series
  • Platforms: E5700
  • NTB (Non-Transparent PCIe Bridging)
  • WBC (Write Backup Cache)

Issue

  • WBC fails to get enabled automatically after the controller is reinserted.

From STORAGE-ARRAY-PROFILE log :

      Read cache:                            Enabled                        
      Write cache:                           Enabled (currently suspended)  
         Write cache without batteries:      Disabled                       
         Write cache with mirroring:         Enabled (currently suspended)  
      Flush write cache after (in seconds):  10.00                          
      Dynamic cache read prefetch:           Disabled                                   

  • Performance degradation (write latency increasing) occurs after re-enabling WBC compared to before removing the optimal controllers.

 

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