Storage pooling to me would be taking all of your SCSI RAID, Fibre RAID and SAN storage infrastructure solutions - regardless of how many storage vendors you currently have and through clustered file systems, virtualization, storage resource management tools or a combination of these technologies - consolidate them all into a single "pool" of storage that can be re-carved up, managed and presented (either through Fibre and/or SAN over IP) to hosts, especially in heterogeneous and enterprise host environments.
The reasons for pooling are varied - to preserve existing investment, simplify management of the storage and simplify backups. More than this though, is for the purpose of adding or extending functionality to your existing and future storage technology. Some of the solutions allow you to add enterprise features to the pool that otherwise might only be available for a high price via a proprietary solution for a specific vendors platform. Some of these features would be volume copying, volume snapshots, local and remote mirroring/ replication, etc. and would extend to all of the storage pool which can make business continuance, backup, application development and disaster recovery easier to implement.
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