Hitachi Data Reduction Estimation Tool
The Hitachi Data Reduction Estimation Tool (hidr_estimator.exe) samples existing data and estimates a data saving ratio.
By using the Data Reduction Estimation Tool before storing data to an FMC, you can estimate the saving percent, and the compressibility of your data. The tool samples data that is in a file or volume that you specify and calculates a compression ratio using the same compression algorithm as the storage system and FMC. By calculating a saving percent for the actual data, you can confirm the effect of accelerated compression with high precision. The Data Reduction Estimation Tool must be installed on the server host that has access to the data you want to sample. For details about how to get or use the Data Reduction Estimation Tool, contact Hitachi Solution Support Center.
The following is an example of executing the Data Reduction Estimation Tool. Best practice is to use the value of Saving % (Except Zero data) in [HAFDC2 Compression].
- Origin Bytes: The data size before compression. The value is approximately 23.4 MiB in the example.
- Compressed Bytes: The data size after compression. The value is approximately 12.3 MiB in the example.
- Saving %: The data-size saving rate after compression. The value is 47.20% 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 47.20% 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 1.9.