Estimating the data-size saving rate by using the hafdc2

Estimating the data-size saving rate by using the hafdc2_estimator tool

The hafdc2_estimator tool can be used to sample existing data to estimate the savings rate. The hafdc2_estimator tool must be installed using the CLI on the server host that has access to the data you want to sample. For details on the hafdc2_estimator tool, contact customer support. The following is an example of executing the hafdc2_estimator:

We recommend using the value of Saving % (Except Zero data) as the saving rate in the formula for estimating FMC capacity. The following explains the items in the execution example.

Items	Description
SAMPLE	The number of data samples. In this example, the value is 3,000. To shorten the time required for estimation, the hafdc2_estimator tool extracts samples from the target data when executed. Therefore, the result output by the tool is an estimated value. The actual savings might vary depending on the situation.
Uncompressed Bytes	The data size before compression. The value is approximately 24 MB in the example.
Compressed Bytes	The data size after compression. The value is approximately 16 MB in the example.
Saving %	The data-size saving rate after compression. The value is 34.32% in the example.
Saving % (Except Zero data)	The data-size saving rate with all zero pages excluded from the data before compression. The value is 32.57% in the example.
Compression Ratio	The ratio of data size compression. In the example, the data size after compression is assumed to be 1, and the ratio of data size compression is 1.5.