# VTS Composite Library

The VTS Composite Library attributes provide performance statistics for a composite virtual tape server (VTS).

Cache Hit Mounts: The number of mount requests for a virtual tape volume in a VTS for which the virtual tape volume is already located in the TVC. In this case, there is no physical tape mount associated with the virtual mount request.

Category Mounts: The count of category or scratch mounts for this composite server.

Controller ID: The controller ID associated with this composite server.

GB Data Copied: The number of gigabytes of data copied by this composite server.

Managed System: The SMS name of this system.

Read Gigabytes: The amount, in gigabytes, of data read by the composite server.

Recall Mounts: The number of virtual mounts that result in a physical mount in the VTS.

Time Stamp: Displays the date and time this data was collected from the VTS.

Volumes Copied: The number of volumes copied by this composite server.

VTS Name: The name of the VTS as assigned through the ISMF panels.

Write Gigabytes: The amount, in gigabytes, of data written by this composite server.