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    • https://kb.netapp.com/on-prem/E-Series/SANtricity-OS-KBs/Write_latency_increases_after_reinsertion_of_E-Series_controller
      NetApp E-Series WBC (Write Backup Cache) WBC fails to get enabled automatically after the controller is reinserted. Read cache: Enabled Write cache: Enabled (currently suspended) Write cache without b...NetApp E-Series WBC (Write Backup Cache) WBC fails to get enabled automatically after the controller is reinserted. 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.