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Caching only system metadata

If the working set of the storage system is very large, such as a large e-mail server, you can cache only system metadata in WAFL external cache memory by turning off both normal user data block caching and low-priority user data block caching.

About this task

When you cache only system metadata, with both flexscale.normal_data_blocks and flexscale.lopri_blocks set to off, WAFL external cache interprets this setting as the buffer cache policy of reuse and does not save normal data blocks or low-priority blocks in the external cache.

Steps

  1. Enter the following command to turn off normal user data block caching:
    options flexscale.normal_data_blocks off
  2. Enter the following command to turn off low-priority user data block caching:
    options flexscale.lopri_blocks off