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How to modify caching policies of Flash Pool aggregate

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Applies to

  • ONTAP 9
  • Flashpool Aggregate
  • Flash Cache

Description

  • Flash Pool is an aggregate that includes both HDD and SDD RAID groups.
  • Since ONTAP 9.1 Flash Pool and Flash Cache both work cooperatively together on the same aggregates
  • Caching policies define how the system caches volume data in a Flash Pool aggregate or Flash Cache.
  • Normally, the default settings are appropriate, but there are situations where it might be required to modify the settings. 
  • It is important to understand how caching policies work before changing them.
    • Only modify the caching policy of a volume(s) only after testing a different caching policy with your workload
    • In most cases, the default caching policy auto is the best caching policy that you can use.
    •  Configuring the wrong caching policy can severely degrade volume workload performance
      • the performance degradation could increase gradually over time.
      • If you experience performance issues with a volume for which the caching policy has been changed, you should return the caching policy to auto.

 

 

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