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Managing Tape Drives
L700 (CTL700) Installation and User’s Guide—527338-004
9-9
Using Multiple Cartridges
If a BACKUP operation requires additional cartridges and the requested
cartridge is not in the tape library, the cartridges already written must be
removed (Dismount, Eject), and the requested tape cartridge must be loaded
into the CAP.
Restoring Tape Files to Disk
Use the RESTORE utility to copy files from magnetic tape to disk. The following
example restores the contents of $TAPE to a specified subvolume on $DISK1
located within the same system:
-> RESTORE $TAPE, $DISK1.*.*, NOPROMPT
Viewing the Contents of a Tape
The RESTORE utility allows the contents of a labeled or unlabeled cartridge
tape before restoring files to disk to be viewed. This example instructs the
RESTORE utility to verify the tape on drive $TAPE0, list the files without writing
the tape to disk, and leaves the tape online so that a RESTORE process can be
started without remounting the tape:
-> RESTORE $TAPE0,*.*, VERIFYTAPE,LISTONLY, NOUNLOAD
Using the BLOCKSIZE Option
Larger BLOCKSIZE attribute values can be used on systems that have installed
a D30 or later version of the RESTORE utility. Larger BLOCKSIZE values can
improve BACKUP performance by increasing the size of data records written to
tape. The BLOCKSIZE option specifies the number of 1024-byte increments
(blocks) in each record.
When using larger block sizes, make sure all tape drives and systems that will
read the tape support the BLOCKSIZE specified.
Before using BLOCKSIZE values larger than 28, consider this:
•
A tape that was backed up with a BLOCKSIZE larger than 28 can be
restored only on a system using a D30 or later version of RESTORE on a
tape drive that supports the larger block transfers.
•
Expanded networks do not support BLOCKSIZE values larger than 28.
For more information about the BLOCKSIZE option, refer to the Guardian Disk
and Tape Utilities Reference Manual.
Note. When the restore operation requires multiple cartridges, the NOPROMPT option
prevents user prompts between tapes. The restore operation continues when the tape drive is
ready and the robot loads the next requested tape.