Tiered Storage—Balancing Application Service with PCFE Requirements 215
There are many different types of clustered and bulk storage systems.
Clustered storage solutions may be block (iSCSI or Fibre Channel), NAS or
file serving, virtual tape library (VTL), or archiving and object- or content-
addressable storage. Clustered storage in general is similar to using clustered
servers, providing scale beyond the limits of a single traditional system—
scale for performance, scale for availability, and scale for capacity and to
enable growth in a modular fashion, adding performance and intelligence
capabilities along with capacity. For smaller environments, clustered storage
enables modular pay-as-you-grow capabilities to address specific perfor-
mance or ...