Note: When running OS simulation tape applications that mount tapes using an IBM 3494 through the tape application RMS interface, you must issue SET TAPECSL OFF before starting CA VM:Tape. This helps prevent CMS from interfering with CA VM:Tape 3494 tape processing. For more information, see the SET TAPECSL and QUERY TAPECSL commands in the VM: CMS Command Reference.
When you specify data set names during OS simulation, you must include periods between the qualifiers; you cannot use blanks. CMS accepts blanks in a data set name, but CA VM:Tape converts blanks to periods. If you were to use blanks between qualifiers, the data set name CMS would write to the internal label and the data set name CA VM:Tape would record in the TMC would not match.
If you create a tape to read later under MVS, you must adhere to z/OS conventions for data set names. Each data set name qualifier must begin with an alphabetic character (A-Z) or a national character ($, #, @), and contain no more than eight characters. The data set name cannot include underscores ( _ ).
When CA VM:Tape mounts a tape in write mode, it sets the data set name in the TMC to ***I/O ERROR***. When CMS successfully closes the file, CA VM:Tape updates the TMC with the correct data set name, as specified on the FID parameter on the LABELDEF command. If the ***I/O ERROR*** data set name remains after your job completes, an error might have occurred while the tape was being written that prevented the file from being properly closed. Check your tape and the procedures that created the tape to determine what the problem might be.
Select data set names carefully and do not change them once the tape has been created. For example, do not use the CA VM:Tape CATALOG command to change the data set name stored in the TMC for a tape used in OS simulation. The CATALOG command does not update the tape's internal label, and when the LABELDEF command validates the internal tape label CMS might send the following message when you try to read from or write to the tape:
DMSTML434E TAP1(181) INPUT LABEL ERROR IN FIELD FILEID, FILE ddname
This message usually means the internal tape label does not match the data set name stored in the CA VM:Tape TMC and, consequently, the fileid (FID) specified on the LABELDEF command.
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