DSNB891I   name IS NOT A VALID GROUP BUFFER POOL OR COUPLING FACILITY STRUCTURE NAME

Explanation

An invalid name was specified on an ALTER GROUPBUFFERPOOL or DISPLAY GROUPBUFFERPOOL command.
name
Either the DB2® group buffer pool name or the backing coupling structure name
You must either specify the DB2 group buffer pool name (gpbname) or the backing coupling facility structure name (strname). Acceptable values for gbpname are GBP0, GBP1, ... , GBP49, GBP32K, GBP32K1, ... , GBP32K9. The strname has the following format: 
     groupname_gbpname

The groupname is the DB2 data sharing group name. The underscore (_) is used as a delimiter between the groupname and the gbpname.

System action

The request is rejected.

System programmer response

Reissue the command specifying a valid group buffer pool name.