You can specify the maximum size of the tape file in terms of tape blocks in a dump command. If you do a remote backup or plan to restore the backup on a system other than the storage system that was backed up, you might need to specify a tape file size.
Suppose you want the maximum tape file to be 2 GB; you must specify 2,097,151. This implies that the largest tape file can contain 2,097,151 tape blocks, which are 1 kilobyte each. The tape file size must be equal to or greater than the blocking factor; otherwise, the dump process terminates.
Some systems support only tape files of a limited size; for example, some Solaris systems do not support tape files larger than 2 GB.
The following command backs up the /vol/vol0 volume using a tape file size of 2,097,151, so that a tape file is no larger than 2 GB:
