ARCBDEXT Parameter List

Table 1. ARCBDEXT Parameter List
Offset	Length or Bit Pattern	Description
00 (X'00')	4	The address of the 140-byte VTOC entry of the data set about to be backed up. The first 44 bytes are the data set name. The contents of the format1 DSCB and how to code the IECSDSL1 mapping macro are described in z/OS DFSMSdfp Advanced Services. Exceptions to the data set VTOC entry include the following: For system-managed VSAM data sets, the data set VTOC entry is that of the data object with the base cluster name contained in the first 44 bytes. For non-system-managed VSAM data sets cataloged in an integrated category facility catalog, a dummy data set VTOC entry is provided containing the base cluster name, data set organization, the change bit (DS1DSCHA), the date the data set was last referred to, creation date, and expiration date. For non-system-managed VSAM data sets not cataloged in an integrated catalog facility catalog, a dummy data set VTOC entry is provided containing the base cluster name and the data set organization. For migrated data sets (being backed up), the data set VTOC entry that is provided contains only the following valid fields: Data set name (base cluster name for VSAM data sets) Data set organization Data set indicators (DS1DSIND) Data set creation date Data set expiration date Data set last-referred-to date Data set record format (non-VSAM)
04 (X'04')	4	The address of a 6-byte data area containing the volume serial number of the volume being backed up. If is backing up an individual data set, the data area contains the serial number of the volume the data set currently resides on. If is backup up a migrated data set, the data area contains the serial number of the original level 0 volume on which the data set resided before it migrated.
08 (X'08')	4	The address of an area with the data set size and other environmental data, as show in Table 1.
12 (X'C')	4	The address of a fullword binary return code.