VLS Utility (VLSUTIL)

CA IPC uses the Virtual Library System (VLS) to maintain certain system files, for example, ADRLIB, ADRPNL, and ADROUT. They are VLS files installed with CA IPC. VLS files have the following properties:

A VLS file is organized logically as a collection of members. Each member is identified by a unique name. All members in a VLS file must have names of equal length. The default standard NAMELEN (name length) for the members in a VLS file can range from 11 characters through 40 characters. The default name length is 27 characters.
Data is stored in VLS internal format in fixed length blocks. Blocksize can range from 960 bytes through 32760 bytes. However, the blocksize cannot be larger than the track size of your storage device. The default blocksize is 4000. Data compression and space recovery are automatic.

The service facility called VLSUTIL (VLS Utility) lets you modify and maintain the VLS files at your site. The following sections describe how to estimate space requirements for a VLS file, how to submit a VLSUTIL function and the utility functions themselves. Additionally, How to Modify the Amount of Space in a VLS File tells how to perform many types of routine maintenance or modification.