tcl.t-cascade Verb: Access/Tape Commands


Command tcl.t-cascade Verb: Access/Tape Commands
Applicable release versions: AP 6.1
Category Tape Commands (36)
Description Cascades or "links" one tape device to another tape device, either in a chain or a loop. Instead of prompting for the next reel, the system will use the forwardly linked device specified.

Tape attachment is not checked. This verb simply updates the links of the tape devices.

When all the devices have been used in a chain, the system will remain on the current device and prompt for the next reel, if necessary.

If the links are set up as a loop, the system will never prompt for the next reel. It will be up to the operator to mount the next reel properly.

All tape drives involved in the cascade must be at the same block size or be able to be changed to the starting drives block size automatically by the system for the cascade to succeed. Remember, certain tape types like floppy drives are limited in their block sizes available.
Syntax t-cascade device.num, device.num, ... {options}
Options c Clears all links for the first device number specified or all devices if none is specified.
t-link 6,8

Tape device 6 will cascade into tape device 8 if the end of reel is encountered 
on device 6. No prompt for the next reel will occur.

t-link 2,3,2

Tape device 2 and 3 are linked as a loop, 2 is linked to 3 and 3 is linked back 
to 2.

t-link 2,3,4,5

Tape devices 2 to 5 are all linked or cascaded together. Only, after device 5 
is filled, the system will prompt for the next reel.

t-link 4 (c

Clears the links associated with tape device 4. This device will now prompt for 
next reel when the end of tape is reached.
Related tcl.t-select