Estimating the FMC capacity to expand an existing pool

When purchasing additional FMC capacity to expand the pool capacity, estimate the capacity to be purchased according to the following workflow:

The following describes the steps shown in the figure:

1. Estimate the pool capacity to be added.

Estimate the pool capacity required for the user in the same way you estimate capacity when creating a pool. If you are expanding a pool, also estimate the additional capacity.

2. Check the data-size saving rate.

The data-size saving rate appears in the Pools window. View the saving rate by clicking the Pools tab, FMC Pool Volumes Capacity, and then Saving (%).

3. Estimate the required FMC capacity.

Use the following formula to calculate the required FMC capacity:

Required FMC capacity = Required pool capacity × (100 [%] - (Saving rate [%] - 10 [%]) )

The value of the margin in the above formula is as follows:

• - 10[%]: Margin representing expected increase in capacity because of degradation in saving

Estimate the additional FMC capacity to be purchased according to the required FMC capacity calculated using the above formula, and the free capacity reserved for writing.

4. Check the free capacity reserved for writing.

In the Pools tab of the Pools window, check the value of FMC Pool Volumes Capacity. The free capacity reserved for writing is the difference between the Total and Used values.

5. Estimate the additional FMC capacity to be purchased.

If the space calculated in step 4 is sufficient, this step is unnecessary. If the space is insufficient, use the following formula to calculate the required FMC capacity:

The required FMC capacity to be purchased = (Required FMC capacity - free capacity reserved for writing in step 4) × 110[%]