Setting the cache-retention policy for Flash Pool aggregates

Beginning with ONTAP 9.0, you can assign cache-retention policies to volumes in Flash Pool aggregates. Data in volumes with a high cache-retention policy remains in cache longer and data in volumes with a low cache-retention policy is removed sooner. This increases performance of your critical workloads by making high priority information accessible at a faster rate for a longer period of time.

Before you begin

You should know whether your system has any conditions that might prevent the cache-retention policy from having an impact on how long your data remains in cache.

About this task

The task must be done in advanced privilege mode.

Steps

  1. Change the privilege setting to advanced:set -privilege advanced
  2. Verify the volume's cache-retention policy:
    By default the cache retention policy is normal.
  3. Set the cache-retention policy:
    ONTAP Version Command
    ONTAP 9.0, 9.1 priority hybrid-cache set volume_name read-cache=read_cache_value write-cache=write_cache_value cache-retention-priority=cache_retention_policy

    Set cache_retention_policy to high for data that you want to remain in cache longer. Set cache_retention_policy to low for data that you want to remove from cache sooner.

    ONTAP 9.2 or later volume modify -volume volume_name -vserver vserver_name -caching-policy policy_name.
  4. Verify that the volume's cache-retention policy is changed to the option you selected.
  5. Return the privilege setting to admin: set -privilege admin