Storage mapping is included with Veritas Storage Foundation for DB2 Enterprise Edition.

Storage mapping allows a DB2 database administrator to display detailed storage layer topology information for a DB2 container. The database administrator can view the layout of all the containers for a tablespace to identify potential trouble spots. You may obtain and view detailed storage topology information using the vxstorage_stats commands or the Veritas Storage Foundation for DB2 GUI.

Access to mapping information is important since it allows for a detailed understanding of the storage hierarchy in which files reside, information that is critical for effectively evaluating I/O performance.

Mapping files to their underlying device is straightforward when datafiles are created directly on a raw device. With the introduction of host-based volume managers and sophisticated storage subsystems that provide RAID features, however, mapping files to physical devices has become more difficult.

With the Veritas Storage Foundation for DB2 Storage Mapping option, you can map containers to physical devices. Veritas Storage Mapping relies on Veritas Mapping Service (VxMS), a library that assists in the development of distributed SAN applications that must share information about the physical location of files and volumes on a disk.