A common problem when you create or import a transport file under the z/OS environment is a failure to specify the correct Data Control Block (DCB) characteristics. When you reference a transport file you must specify the following DCB characteristics:
Note: A BLKSIZE value of less than 8000 may be more efficient for your storage device in some cases. The BLKSIZE value must be an exact multiple of the LRECL value.
Another common problem can occur if you use communications software to move files from another environment to z/OS. In some cases, the transport file does not have the proper DCB characteristics when it arrives on z/OS. If the communications software does not allow you to specify file characteristics, try the following approach for z/OS:
Create a file under z/OS with the correct DCB characteristics and initialize the file.
Move the transport file from the other environment to the newly created file under z/OS using binary transfer.