Implementing Security for DFSMS › DFP 3.0 and DFSMS › Storage Groups

Storage Groups

The DASD volumes that are to be SMS controlled are divided up into Storage Groups that are similar in concept to DASD esoteric unit names. They are similar in that they define a group of volumes, but they are different in the following way:

• Storage Groups have volume maintenance characteristics associated with them.
• All volumes in a Storage Group must have the same device characteristics, such as number of tracks per cylinder and number of bytes per track.
• A given volume can only be in one Storage Group.
• The definition of Storage Groups that are shared among multiple SMS systems are identical because each system shares the control data sets that define them.