IBM Magstar 3494 manual Shows the VTS Mount Hit Data window

VTS Mount Hit Data

Figure 73 shows the VTS Mount Hit Data window.

Figure 73. VTS Mount Hit Data Pop-Up Window

The VTS Mount Hit Data window displays a graph showing how logical mounts have been accomplished as a percentage of the total mounts for an hour. The three

types are: Fast ready, cache hit, and logical mounts requiring a recall. A separate graph is available for each VTS in the Library. Data is displayed for the previous 24 hours. The current hour's data is designated by the diamond shaped marker.

A Fast Ready Hit is a mount that the host requested where the category of the volser was designated as a ªFast readyº category. This type of mount does not require any recall of data from tape. This is the fastest type of mount.

A Cache Hit is a mount where the volume to be mounted still resides within the

VTS cache. This type of mount does not require any recall of data from tape.

A Physical Mount Required means that a stacked volume needed to be mounted and data read from it to satisfy the logical mount request. This is the slowest type of mount.

The graph displays 3 lines, one for each type of mount, as a percentage of the total number of mounts for an hour.

126Magstar 3494 Tape Library Operator Guide