ClearPath OS 2200 Series Release 13.2 Software Planning and ...

Tape and DVD
The Exec provides the unique equipment mnemonic U9840C for the device and the
existing control unit mnemonic CU98SC (SCSI) or CU98SB (SBCON) for configuring the
subsystem and the unique specific assign mnemonic HIS98C for assigning tape files.
Other than generic assign mnemonic T, existing assign mnemonics used to assign ½ -inch
cartridge tapes cannot be used to assign T9840C tape drives.
The Exec supports T9840C tape subsystems as boot devices, system dump devices,
and for checkpoint/restart. Checkpoint can assign tape devices with new assign
mnemonic HIS98C, or the more generic assign mnemonic T. Restart can assign T9840C
tape devices with new assign mnemonic, HIS98C.
Considerations for using T9840C tape subsystems are as follows:
• Tape used by the T9840C has a native capacity of 40 GB.
Caution
If you drop a 9840C tape cartridge from a height of less than 1 meter, the
cartridge is warranted to continue to read and write new data, but the media
life might be shortened. Therefore, Unisys recommends that you copy data
from a dropped cartridge to another cartridge and retire the dropped
cartridge. Because the compressed capacity could be 80 GB per cartridge or
greater, the importance of protecting cartridges from being dropped cannot
be overstated.
• In order to crossboot to previous Exec levels that do not support a new device type,
you must use a partitioned data bank (PDB) that does not contain the new device
type. Products that are sensitive to the new device equipment mnemonics and file
assignment mnemonics can be affected.
• Read backward I/O functions are not supported. If a read backward is attempted, it is
terminated with an I/O error status of 024 (octal).
• T9840C tape subsystems cannot read traditional 9-track, 18-track, 36-track, DLT, or
CTS9940B formatted tapes. To read these tapes and to transfer data to a T9840C
tape subsystem, you must have a tape device on the host system that can read the
9-track, 18-track, 36-track, DLT, or CTS9940B formatted tapes. You can then transfer
the data to the T9840C tape subsystem.
• The function of general assign mnemonic T is expanded so that it can be used with
T9840C tape subsystems.
• Using ACS names as assign mnemonics is not supported for T9840C tape
subsystems. You should use assign mnemonic HIS98C (or absolute device assign)
when assigning T9840C tape drives. If an ACS name is specified in a tape
assignment statement, the Exec attempts to assign only 1/2-inch cartridge tape
drives (for example, HIC, HICL) available in ACS.
• T9840C tape subsystems can read 9840A/9840B tape media, but cannot write to the
media.
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