The first file of each sequential migrate tape is a data set created by CA Disk. This data set is a dummy file that contains no information, but its presence helps prevent data loss when you are using a tape library management system such as CA 1 Tape Management.
The expiration date of the first file is the highest expiration date on the tape. It is equal to the expiration date of the second file on the data set. When writing data sets to tape, CA Disk sorts the data sets in expiration date sequence, from the highest to the lowest.
Default processing leaves this first data set uncataloged. Specify the DMYCATLG parameter of the MODESET command to catalog this data set.
The data set name CA Disk assigns to this first file is a combination of the data set name from the MIGRATE JCL and a generated date and time stamp. This CA Disk-generated data set name for the first file helps provide consistency between the sequential migrate tapes, and can make them easier to manage. The first data set name on a tape is part of the criteria CA 1 Tape Management uses in determining what action to take on a tape, such as marking the tape as a scratch tape.
The base name of the data set is taken from the data set name in the MIGRATE dd statement for the primary tape, and the MIGRATEC dd statement for the copy tape. CA Disk generates a 22- character appendage to the base name as follows:
The previous calendar date is the current date in Julian format, and the time of day is in hours/minutes/seconds. Therefore, the first file's data set name will reflect the date and time it was created, and will always be unique. An example is SYS.MIGRATED.DMSC.C198827.T113015. When considering a base name makes sure that there is enough room for the CA Disk generated appendage.
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