Changing an allocation threshold

Use this procedure to change an allocation threshold.

From Level6(6) to Level31(31), allocation thresholds can be changed. However, for tiering policies from All(0) to Level5(5), allocation thresholds cannot be changed.

Before you begin

The Storage Administrator (System Resource Management) role is required to perform this task.

Procedure

  1. Open the Pools window.

In Command Suite:

  1. On the Resources tab, click Storage Systems, and then expand All Storage Systems and the target storage system.

  1. Right-click DP Pools, and then select System GUI.

In Device Manager - Storage Navigator:

  1. Click Storage Systems, and then expand the Storage Systems tree.

  1. Click Pools.

  1. In the Pools window, click Edit Tiering Policies.

  1. In the Edit Tiering Policies window, select the tiering policy that you want to change and click Change. The Change Tiering Policy window appears.

  1. Select the Allocation Threshold checkbox.

  1. Change thresholds, and click OK.

  1. Return to the Edit Tiering Policies window.

Each allocation threshold value is needed in order to meet the conditions described in the following table.

  1. Click Finish.

The Confirm window appears.

  1. In the Task Name text box, type a unique name for the task or accept the default.

You can enter up to 32 ASCII characters and symbols, with the exception of: \ / : , ; * ? " < > |. The value "date-window name" is entered by default.

  1. Click Apply.

If the Go to tasks window for status check box is selected, the Tasks window appears.

Item

Explanation

Tier1 Max

Satisfy either one of following:

Equal to Tier1 Min

Bigger than Tier1 Min

Tier1 Min*

Satisfy either one of following:

Equal to Tier1 Max

Smaller than Tier1 Max

Tier3 Max

Satisfy either one of following:

Equal to Tier3 Min

Bigger than Tier3 Min

Tier3 Min*

SSD

Satisfy either one of following:

Equal to Tier3 Max

Smaller than Tier3 Max

* The sum of Tier1 Min and Tier3 Min must be 100 (%) or less.