gtpm1m3pTPF V4R1 Migration Guide: 3.1 to 4.1

Tape Support

The TPF 4.1 system provides an automatic tape mounting facility that allows you to do the following without operator intervention:

You determine which tapes can be mounted automatically on which devices by creating tape groups, assigning tape labels to tape groups, and assigning tape devices to tape groups.

When a device is enabled for automatic tape mounting, the TPF 4.1 system automatically mounts an ALT tape if a write-enabled cartridge with an elapsed expiration date is loaded into the device. When the TPF 4.1 system needs an active or standby tape, it searches for an eligible ALT tape and converts it.

The TPF 4.1 system has enhanced system availability by providing lost interrupt detection for tapes. When the TPF 4.1 system detects a lost interrupt, the system either reports a permanent error to the application program or performs a tape switch. When the TPF 4.1 system detects a stalled tape module queue with no pending interrupt, it reports a permanent error to the application program. The ZCTKA command allows you to set the stalled tape module queue time-out value. See Modifying Storage Allocation Values Online for more information about the ZCTKA command.

Automatic Tape Mounting and Capture and Restore

Capture and Restore processing suspends automatic tape mounting on all tapes used for Capture and Restore (except for the exception recording and keypoint Capture and Restore) until its processing is complete. Automatic tape mounting resumes when processing is complete.