9710 (StorageTek) Addendum for NonStop Servers
Addendum to the StorageTek™ 9710 for the Tandem Environment 
The 5155/5159 Digital Linear Tape CRE and NonStop Kernel 
9-54
CATALOG {ON  OFF} 
Requests the services of the DSM/Tape Catalog (which 
might not be installed on the system). Specify OFF to use 
the CLASS TAPECATALOG DEFINE template without  
using DSM/Tape Catalog. Specify ON to use the 
DSM/Tape Catalog. 
COMPRESSION {ON  OFF} 
Overrides the system-wide default compression specification 
on a job-by-job basis for any tape in a 5155/5159, 5150 or 
5151 drive. (The 5194 tape drive is unaffected by this 
attribute.) COMPRESSION can be set ON or OFF. 
Notes:  
• After executing a CLASS TAPECATALOG DEFINE, the 
system returns to the system-wide default specification for the 
next job. 
• If the COMPRESSION attribute is not specified in the 
DEFINE, the system uses the default compression specification 
set by the MEDIACOM ALTER MEDIADEFS command. 
• If no default specification was set using the ALTER 
MEDIADEFS command, the default compression specification 
for any tape on a 5155/5159, 5150 or 5151 drive is OFF. 
• Applications specifying a CLASS TAPE DEFINE always use 
the system-wide default specification for compression, because 
there is no COMPRESSION attribute for a CLASS TAPE 
DEFINE. 










