Overview and planning of zEnterprise Data Compression (zEDC)
In todayss z/OS® environment, many installations want to compress certain types of data to occupy less space while it is not in use, and then restore the data when necessary. Using zEnterprise® Data Compression (zEDC) to compress data might help to reduce CPU cost and elapsed time of data compression compared to traditional software-based compression services, such as CSRCESRV and CSRCMPSC. zEDC can also decrease the cost of applications that use host-based compression that are running on z/OS.
zEDC supports the DEFLATE compression data format, which compresses data by using the following
algorithms, which are defined by RFC 1951:
- LZ77
- Replaces repeated string with length, back pointer pairs.
- Points back up to 32 K.
- Huffman coding
- Variable length encoding of characters.
- Minimize bit length of a stream of characters by assigning shorter codes to more frequent characters.
- Data and length, back pointer pairs are Huffman encoded.
For help with getting started, and access to various technical resources about Integrated Accelerator for zEDC, see Integrated Accelerator for zEDC.