ARCCDEXT Parameter List

Table 1. ARCCDEXT 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 reblocked. The first 44 bytes are the data set name.
04 (X'04')	4	The address of a 7-byte area. The first 6 bytes contain the volume serial number of the volume the data set was migrated from or backed up from. Byte 7 contains a data mover flag in bit 0 that indicates the data mover that was used. 0... .... If bit 0 of byte 7 is set to 0, DFSMShsm has moved the data. 1... .... If bit 0 of byte 7 is set to 1, DFSMSdss has moved the data.
08 (X'08')	4	The address of a fullword binary area containing the approximate size of the data set in units of 1024 bytes. The size is that of the space required to recall or recover the data set.
12 (X'0C')	4	The address of a fullword binary area containing one of three values that determine the block size DFSMShsm uses if the data set is reblocked. The DFSMSdss mover always passes a value of zero, which directs the system to calculate the block size for a data set. The DFSMShsm mover passes a value that offers greater track utilization on the target device (the largest acceptable block size nearest to 6144) or it passes the current block size. You can change this variable and use a different value. If you return a value greater than 32␠760 or less than the record size, DFSMShsm uses the value passed to the exit. If DFSMSdss is the data mover, the value in this field is ignored.
16 (X'10')	4	The address of a fullword binary return code for the exit to set to zero to cause DFSMShsm to reblock the data set, or nonzero if DFSMShsm should not reblock the data set during recall or recovery.