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Compression enabled volumes won't read from Flash/External  cache

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • ONTAP 9
  • External/Flash Cache
  • FAS

Issue

  • The READ hits from external cache would not happen for a volume which has compression enabled.
  • This would lead to more reads happening from the Disk layer and higher would be the latency driven from the spinning media(Disks)
  • In case of more number of compressed volumes , a system may suffer from high Disk utilization , as the external cache would be barely used.

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