Specifying Multivolume Extents

You can define spaces that span up to 25 volumes for VSAM files. All of the volumes must be accessed and assigned when you issue the DLBL command to define or identify the data space.

You should remember, though, that if you are using AMSERV and you do not use the PRINT option, you must have a read/write CMS disk so that AMSERV can write the output LISTING file.

If you are defining a new multivolume data space or unique cluster, you must specify the extents on each volume that the data is to occupy (starting track and number of tracks) followed by the disk mode letter where the disk is accessed and the programmer logical unit to which the disk is assigned. For example:
access 135 b
access 136 c
access 137 d
assgn  sys001 b
assgn  sys002 c
assgn  sys003 d
dlbl newfile b (extent sys001
If you specify more than one extent on the same line, the extents must be separated by commas. Different extents for the same volume must be entered consecutively.
When you enter multivolume extents, you can use a default mode. For example:
dlbl newfile b (extent sys001
DMSDLB331R Enter extent specifications:
100 60, 400 80, 60 40 d sys003,
2000 100 c sys002
   (null line)
Any extents you enter without specifying a mode letter and SYSxxx value default to the mode and SYSxxx on the DLBL command line, in this case, the B-disk, SYS001.

If you make any errors issuing the DLBL command or extent information, you must re-enter the entire command sequence.