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 the
T9840A. When T9840A 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 the library to perform the
cleaning.
• The following products or features are required to support T9840A tape subsystems:
− The Client System Component (CSC) library product supports the library
configuration for T9840A tape subsystems.
− The SCSITIS and /or the CARTLIB separately packaged Exec features must be
installed in order to configure T9840A tape drives.
− TeamQuest MSAR level 6R1D (or higher) and TeamQuest LA level 6R4 (or
higher) are required to support T9840A tape subsystems.
• Sort/Merge consideration – A tape volume for T9840A tape subsystems can store up
to 40 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 T9840A 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 passing
a NUMREC or RECORD parameter to the SORT processor runstream.
4.6.8. T9840C Tape Subsystem
T9840C tape subsystems connect to ClearPath systems server channels through Fibre
Channel (FC) SCSI and SBCON channels. T9840C tape subsystems can be used in STK
tape libraries.
T9840C tape subsystems use the existing Client System Component (CSC) library
feature when it is included in tape libraries (this version of CSC still uses the STK$
Executive request). The tape device driver is supported within the Exec through the
SCSITIS separately packaged Exec feature when the T9840C attaches to the host
through FCSCSI channels.
T9840C tape subsystems provide a maximum capacity per cartridge of 40 GB of
uncompressed data. Tape subsystems use the LZ1 data compression algorithm, which
can improve capacity by a factor of 2 and greater. However, individual results might vary
depending on characteristics of the data and other variables.
The tape cartridges use half-inch tape. These cartridges are not interchangeable with the
cartridges used with 18-track, 36-track, DLT, or CTS9940B tape drives.
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