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iSeries single-level storage treats all storage as one large virtual address space (this includes main storage as well as disk storage). There is no concept of a disk volume or data set partition. However, the system provides the capability to separate this contiguous address space into smaller disk pools to make system backup and recovery faster and to provide Hierarchical Storage Management facilities. These pools are called auxiliary storage pools.
Conceptually, each ASP on the system is a separate pool of disk units for single-level storage. The system spreads data across the disk units within the ASP. If a disk failure occurs, recover only the data in the ASP that contains the failed unit. The use of ASPs can reduce system backup time. To do this, create ASPs to include individual applications and data. A single ASP can then be backed up without impacting business operations while other applications that operate from different ASPs stay online.
An IASP can also be made dedicated, rather than switchable, for isolation of an application and its associated data.
