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Operating the 9840 Tape Drive
9840 Tape Drive Operations Guide—429596-002
3-13
Restoring Tape Files to Disk
Restoring Tape Files to Disk
Use the RESTORE utility to copy files from magnetic tape to disk. This 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 tape cartridge
before restoring files to disk to be viewed. The following example instructs the
RESTORE utility to verify the tape on drive $TAPE0, list the files without writing the
tape to disk, and leave 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 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:
•
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.
Using the NOUNLOAD Option
The NOUNLOAD option directs the BACKUP utility to rewind the final tape and leave it
online in the drive when the BACKUP process is completed. If the NOUNLOAD option
in the BACKUP command is not specified the robot returns the last tape cartridge to its
slot within the 9710 ACS Tape Library, when the drive is finished writing to the tape.
The robot then loads the next tape cartridge requested.
-> BACKUP $TAPE1, $MYDISK.MYVOL.*, NOUNLOAD
Note. When the restore operation requires multiple tape 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.