The physical organization of a database is composed with dbextents, VSAM clusters for DB2 Server for VSE or minidisks for DB2 Server for VM those dbextents are assigned to a storage pool(STORPOOL) during database generation or during ADD DBEXTENT function.
If a disk on which the database is defined is damaged, it is necessary to restore the lost information. You can restore the whole database or decide to restore only the affected pool. When performing storage pool level recovery, the SHOWPOOL function is used to identify which pools must be restored by listing the dbextents associated with each storage pool defined on the database server.