aix磁带备份系统问题， 急！！！！！

各位大侠，请教个问题，我在用磁带备份整个aix系统时，每次备份到
96%这里就失败了， 是什么原因？ 该怎么处理？ 谢谢！
backup: 0511-449 An error occurred accessing ./oracle/oradisk/database/stage/sizes/oracle.server11.2.0.1.0Custom.sizes.properties: A file or directory in the
path name does not exist.
backup: 0511-449 An error occurred accessing ./oracle/oradisk/database/stage/sizes/oracle.server11.2.0.1.0EE.sizes.properties: A file or directory in the pat
h name does not exist.
backup: 0511-449 An error occurred accessing ./oracle/oradisk/database/stage/sizes/oracle.server11.2.0.1.0SE.sizes.properties: A file or directory in the pat
h name does not exist.
backup: 0511-449 An error occurred accessing ./oracle/oradisk/database/welcome.html: A file or directory in the path name does not exist.
.........................
399170 of 471313 files (84%)..............................
410174 of 471313 files (87%)..............................
456782 of 471313 files (96%).lseek: A system call received a parameter that is not valid.
backup: 0511-084 An internal packing error occurred: incorrect size
backup: 0511-442 ./dev/null 2>&1 will not be backed up.
.....
0512-003 mksysb may not have been able to archive some files.
The messages displayed on the Standard Error contained additional
information.