Data Backup 12-7
A tape can contain multiple tape files, but any tape must contain at least one com-
plete tape file.

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The dump command can use these types of tape files:
Local or remote. (Refer to Devices Used by the Dump Command for more
information about where the tape devices can be located.)
Rewind or norewind. If the tape file is a rewind file, the filer rewinds the tape
after it finishes writing the tape file. If you want the dump command to write
multiple tape files on the same tape, specify norewind tape files in the
dump
command.
The name of a norewind tape file begins with an n (for example, nrst0a); the
name of a rewind tape file begins with an r (for example, rst0a).
Unload/reload tape files. These tape files apply only if you are backing up to tapes
in tape stackers. When you use these tape files, the dump command unloads the
tape when it reaches the end of tape, and then the tape stacker reloads another
tape.
The name of an unload/reload tape file begins with a u (for example, urst0a).
An unload/reload tape file cannot be a norewind tape file. For example, do not
specify unrst0a.
NOTE: If the tape stacker is attached to a remote host, the dump command can
reload the tape only if that host supports automatic reloading.
Standard output, which is specified as - in the dump command.
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Before you enter the dump command, you must determine the amount of backup
data so that you can estimate the number of tape files and the number of tapes
required for the backup.
The procedure for estimating the amount of data depends on whether the data is in a
qtree.

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To display the number of kilobytes used for the qtree, enter the quota report
command.