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

Tape and DVD
• An LED indicator on a tape device lights when the drive needs cleaning or the tape is
bad. The operator clean message to the system console is also supported for
T9840C tape subsystems. When T9840C tape subsystems are part of a tape library,
the Automated Cartridge System Library Software (ACSLS) should be set to the
autocleaning-enabled mode. This enables the ACSLS and library to perform the
cleaning.
• The following products or features are required to support T9840C tape subsystems:
− Client System Component (CSC) library product supports the library
configuration for T9840C tape subsystems.
− SCSITIS separately packaged Exec feature must be installed in order to
configure T9840C tape drives.
− TeamQuest MSAR level 7R2A (or higher) and TeamQuest LA level 7R2 (or
higher) are required to support the T9840C tape subsystem.
• Sort/Merge consideration—A tape volume for T9840C tape subsystems can store up
to 80 GB or more of compressed data. In the past, unless a NUMREC parameter
was specified or scratch files were explicitly assigned, the SORT processor assumed
that tape files would fill the tape volumes associated with the file. Based on that
assumption, the SORT processor would assign appropriately sized scratch files.
Because of the size of tape volumes for T9840C tape subsystems, the SORT
processor no longer makes that assumption. Now, the SORT processor assumes
that the last tape volume associated with each input file assigned to a tape device
contains 2 GB. If the last tape volume of a file contains more than 2 GB, you must
assign appropriately sized scratch files before calling the SORT processor or pass a
NUMREC or RECORD parameter to the SORT processor runstream.
4.6.9. T9840D Tape Subsystem
The T9840D tape technology provides for higher density compared to 18 and 36-track
tapes and almost twice the capacity of the T9840C. The maximum data capacity per
cartridge supported by the T9840D is 75GB uncompressed compared to 40GB for the
T9840C. The high density T9840D writes 576 tracks on a tape. The T9840D is three
times faster that the T9840A, 1.6 times faster than the T9840B, and as fast as the
T9840C. The new drive accepts the same medium as the T9840A, T9840B and T9840C.
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