You can use the FR or UL option, explained under “Standard Commands” earlier in this section, to indicate that the input file has no label. Without label information, DUMPALL cannot determine the record size or block size to use, so you must specify the MAXRECSIZE and BLOCKSIZE file attributes. Without label information, the operating system cannot identify the tape to select without operator intervention. Thus, when DUMPALL opens the input tape file, the operating system suspends DUMPALL with one of the following messages:
<mix number> NO FILE UL (UNLABELED MT) #1 <mix number> NO FILE FR (UNLABELED MT) #1
By entering the following system command, the operator assigns to DUMPALL an unlabeled file on the indicated unit:
<mix number> UL MT nn
If you specify UL and do not use either the MULTI or the SKIPTM option, the operating system performs an automatic reel switch when it reads a tape mark from the tape. It then suspends DUMPALL with the following RSVP message:
<mix number> NO FILE UL (UNLABELED MT) #2
The operator can continue to force the operating system to select a tape by using the UL (Unlabeled) system command. After the operating system reads the last tape, the operator must enter the following response to inform the operating system that the last tape used was the final reel:
<mix number> FR
If you specified FR, or used UL in conjunction with MULTI, SKIPTM, or both, the system requests no further input file at the end of the first input tape.
| Note: | The operator can also select a labeled tape as a response to the “NO FILE” message. If this happens, your DUMPALL command probably executes incorrectly because DUMPALL treats the beginning label records as the data blocks of the first file on the tape. So, DUMPALL copies or prints the label records instead of the data records. |
