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Using Your Digital Data Storage (DDS) Tape Drive
Operating the DDS Tape Drive
If you use the /dev/rmt/3hcn device file, the drive compresses the data, but
does not rewind the data cassette. The tape stays where it was left after the
last operation.
If you use these device files, you do not need to create any device files.
Archiving Data in Compressed and Noncompressed Mode
This section describes how to transfer data to and from a DDS- format data
cassette (saving and restoring) using the HP-UX tar command and your tape
drive’s device file.
NOTICE: Before using your DDS-format tape drive to back up your file system,
make sure you read the “Media Interchangeability Restrictions” section
later in this chapter.
The tar (tape file archiver) command allows you to save files to a data cas-
sette, restore files from a data cassette to your system, or list the files on your
data cassette.
The examples in this chapter use the device file /dev/rmt/3m, which
archives the data in noncompressed mode and causes the drive to rewind the
data cassette. To use data compression, substitute
/dev/rmt/3hc for /dev/rmt/3m. If you named your device files differently,
substitute the correct file name where appropriate.
NOTICE: A DDS-format tape drive with data compression capability is labeled
DCLZ on its front panel.
Writing to a Data Cassette
Use the following instructions to save files to a data cassette:
1 Check that the write-protect tab on the data cassette is in the write position.
2 Load the data cassette into the tape drive.
3 Click on the Terminal Control on the Front Panel of your Workspace.
A terminal window opens.