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Enabling and disabling high resolution sampling for the cache emulated by PCS

If Predictive Cache Statistics (PCS) is enabled on your storage system, you can enable or disable high resolution sampling for the cache emulated by PCS. High resolution sampling might improve measurements of workloads with small hot spots.

Before you begin

PCS must be enabled.

About this task

The flexscale.pcs_high_res option enables or disables high resolution sampling for the cache emulated by PCS. This option is used only when PCS is enabled (setting flexscale.enable to on), and your storage system does not have a caching module installed.

This command is available through the nodeshell. You access the nodeshell by using the system node run command. For more information, see the man page.

Step

  1. Enter the following command to enable or disable high resolution sampling for the PCS cache: options flexscale.pcs_high_res {on|off}

    The default value is off and should suffice for most workloads. Measurements of workloads with small hot spots might improve when you set the value to on.