ETERNUS SF Storage Cruiser V16.0 Operation Guide for Optimization Function

3.5.4 Change Number of Layers of Tier Pool

By changing from the Tier pool of one layer to the Tier pool of two or three layers, the Automated Storage Tiering can be operated.

Moreover, the Tier pool of two layers can be changed to the Tier pool of three layers.

Point

• As for the sub-pool of one layer, the layer level is set to High (fixation) beforehand.

• As for the sub-pool of two layers, the layer level becomes set of Low and High (fixation).

The procedures to change the layer number and begin the Automated Storage Tiering are as follows.

1. Stop the Automated Storage Tiering for the target Tier pool.
   Refer to "Start/Stop Automated Storage Tiering for Tier Pool" in the ETERNUS SF Web Console Guide for the operational procedure.

2. Create a Tiering policy.
   Refer to "Create Tiering Policy" in the ETERNUS SF Web Console Guide for the creating method.
   If use the Tiering policy that has already been created, this step is unnecessary.

3. Change the layer number of the target Tier pool.
   Refer to "Change Number of Layers of Tier Pool" in the ETERNUS SF Web Console Guide to execute the following tasks.

   • Add the Low sub-pool when changing from one layer to two layers.

   • Add the two sub-pools in order of the Low sub-pool and the Middle sub-pool when changing from one layer to three layers.

   • Add the Middle sub-pool when changing from two layers to three layers.

4. Change the layer level of each layer and the sub-pool name, and set the corresponding Tiering policy if necessary.
   Refer to "Change Tier Pool" in the ETERNUS SF Web Console Guide for the operational procedure.

5. Start the Automated Storage Tiering for the target Tier pool.
   Refer to "Start/Stop Automated Storage Tiering for Tier Pool" in the ETERNUS SF Web Console Guide for the operational procedure.