Hierarchical Storage Management (HSM)
Hierarchical storage management (HSM) provides an automatic way of managing and distributing data between the different storage layers in order to meet the users' needs for accessing data while minimizing the overall cost.
Migration
Through the use of BRMS migration control groups, you can select which data to move from faster, relatively expensive DASD to slower but less costly DASD. You might also set these control groups up to move the data in the opposite direction if it become more frequently accessed.
Archive
Dynamic Retrieval
Besides having the ability to archive the data off to removable media, it is just as important to recover the data. A user can easily recover the data using the normal BRMS recovery process; however, BRMS also provides Dynamic Retrieval of the data. This allows the recovery action to be prompted by a simple access of the data. For example, if a database file has been archived, but an application actually tries to access this file, BRMS will then be asked to restore the file. After the file is restored, the application continues on. There is no major disruption in the application other than a delay for the restore of the file.