Active Library

The Active library (called MAINLIB) is the on-site media storage location for volumes. The smallest unit in the Active library is the data set. Each data set has an expiration date associated with it.

Data sets are stored on removable media volumes in the Active library. If space exists, several data sets can be stored on one volume. When necessary, one data set can span several volumes.

Data set records are created and expired in the Active library. During the lifetime of a data set, the volumes on which it is stored may be transferred to various vaults.

Several methods exist for adding volumes to the Control-M/Tape Active library:

• performing a conversion of existing data when first implementing Control-M/Tape at your site

  For more information, see the INCONTROL for z/OS Installation Guide.

• manually defining new volumes using the CTTDLD utility, described in the INCONTROL for z/OS Utilities Guide
• setting Control-M/Tape to add volumes dynamically upon volume access (Automatic Check-In)
• using the External Volume Check-In Facility