To extend the block length for a DAM file, after first backing up the file using the dambkup command, execute the damrstr command, specifying the block length of the physical file in which to restore the backup data. There are two ways of extending the block length: one method keeps the block structure and the other does not. With the method that keeps the block structure, the restore-destination DAM file keeps the same block structure as the backup-source DAM file. With the method that does not keep the block structure, the data in the backup-source DAM file is written to the restore-destination DAM file from the first block in the file. When you wish to keep the block structure, specify the damrstr command with the -e option, specifying the extended block length. When you do not wish to keep the block structure, specify the damrstr command with the -p option, specifying the extended block length. You cannot extend the block length of a file that is backed up in online mode. Also, you cannot specify a DAM file with an extended block length as the recovery definition file in the damfrc command arguments.