SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

LIKE object
identifies an existing object whose attribute values are copied to the object affected by this
command. The object name must currently exist in the system configuration, and the object
type must match that of the object affected by this command. If you specify LIKE, any attribute
values that you explicitly specify override the attribute values of the LIKE object.
The LOCATION, SAC, and DEVICEID values are not copied from the LIKE object. To assign
values to these attributes, you must explicitly specify them.
attribute-spec
is one or more “ALTER TAPE Attributes”.
ALTER TAPE Attributes
[ , BACKUPCPU number ]
[ , COMPRESSION { ON | OFF } ]
[ , DENSITY { 1600 | 6250 } ]
[ , DEVICEID number ]
[ , HIGHPIN { ON | OFF } ]
[ , KEYGENPOLICY policy[ , LOCATION (group,module,slot) ]
[ , LUN number ]
[ , MAXOPENS number ]
[ , NEWENCRYPTKEY[ , PORTNAME number ]
[ , PRIMARYCPU number ]
[ , PROGRAM [[$vol.]subvol.]fileid ]
[ , RECSIZE number ]
[ , SAC { number | name } ]
[ , STARTSTATE { STARTED | STOPPED } ]
BUFFERING { ON | OFF }
for tapes connected through a CLIM, allows tape processes to buffer multiple TAPE WRITE
commands, which in most cases results in improved performance. The default is OFF.
BACKUPCPU number
is the processor in which the backup IOP starts. The process must be in the STOPPED state or
not running for you to alter this attribute.
COMPRESSION { ON | OFF }
(cartridge tapes only) specifies whether data compression is configured
The tape process compresses data using Improved Data Recovery Capability when writing to the
cartridge tape (default).
ON
The tape process does not compress data when writing to the cartridge tape.OFF
This setting can be overridden by the MEDIACOM ALTER TAPEDRIVE MEDIADEFS command.
See the discussion on date compression in the DSM/Tape Catalog User’s Guide.
DENSITY { 1600 | 6250 }
(5170 tape drives only) is the tape density in bpi. (Other tape drives use a standard density
which is displayed by the INFO TAPE command.) The default is 6250.
DEVICEID number
is the device ID of the tape drive.
This value must match either the SCSI ID of the tape drive (if SCSI-connected) or the device ID
of the tape (if Fibre Channel connected).
If the tape drive is connected to a PMF CRU, an IOMF CRU, or an SNDA, number is in the
range 0 through 5. The default is 5.
If the tape drive is connected to an F-SAC of an SNDA, number is 4 or 5.
242 Storage Subsystem Commands