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9.2.
Theory of Operation
Thin provisioning, in a shared-storage environment, provides a method for optimizing
utilization of available storage. It relies on on-demand allocation of blocks of data versus
the traditional method of allocating all the blocks up front. This methodology eliminates
almost all whitespace which helps avoid poor utilization rates, that occur in the traditional
storage allocation method where large pools of storage capacity are allocated to individual
servers but remain unused (not written to. This traditional model is often called "fat" or
"thick" provisioning.
With thin provisioning, storage capacity utilization efficiency can be automatically driven up
towards 100% with very little administrative overhead. Organizations can purchase less
storage capacity up front, defer storage capacity upgrades in line with actual business
growth, and save the operating costs (electricity and floor space) associated with keeping
unused disk capacity spinning.
9.2.1.
Thin Provisioning Architecture
A thin provisioning pool is a collection of disk groups which contain disk drives. Similarly, a
storage pool is grouped to provide capacity for volumes. Volumes are then allocated out of
the storage pool and are mapped to LUN which can be accessed by a host system. The
following is the storage architecture of a thin provisioning pool.
Figure 9-4
Storage Architecture of Thin Provisioning Pool
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