Storage Group Alter Option

The Storage Group Alter screen performs all functions of the SQL ALTER STOGROUP statement. The alter statement changes the definition of a storage group. The DB2 ALTER statement can change all the parameters used initially to create the storage group, except the VSAM catalog name and the name of the storage group itself.
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The Storage Group Alter screen performs all functions of the SQL ALTER STOGROUP statement. The alter statement changes the definition of a storage group. The DB2 ALTER statement can change all the parameters used initially to create the storage group, except the VSAM catalog name and the name of the storage group itself.
You can add or delete volumes using the DB2 ALTER STOGROUP statement. The changes do not affect the storage of existing objects in the storage groups, but do affect the future assignments of storage within the group: an object defined later can be assigned to an added volume, but cannot be assigned to a deleted volume.
To change the storage group name, VCAT name, or creator name, you must drop and re-create the storage group. If this type of change is made, the RC/Alter Specification screen appears and you will be prompted for information about the data set to which the DDL should be written. The DDL must then be executed in batch mode. 
If the alter is one that can be performed by a DB2 ALTER STOGROUP statement, a confirmation screen appears where you can accept, edit, or reject the DDL to be executed.