What is hitachi dynamic provisioning?

Hitachi Dynamic Provisioning (HDP)

Dynamic provisioning in Hitachi virtual storage platform(VSP) is works on concept of thin provisioning.

Hitachi Dynamic Provisioning (HDP) was first introduced on the USP V/VM arrays. It provides a mechanism for grouping multiple RAID Groups of same RAID type and same disk type into a single pool which is DP pool. Dynamic Provisioning Volumes (DPVOLs) can be created with specified logical size (up to 60TB) on DP pool and present them to host.

The host(server) accesses the DPVOL as if it is a normal volume. A primary difference is that physical space is not allocated to a DPVOL until the host starts writes at the DPVOL. Whenever a host starts writing data in DPVOL (Thin Vol), data written into DP Pool and stripes across RAID groups in stripes. The stripe size 42MB.

By using dynamic provisioning we can eliminate the allocated but unused space in storage system. Dynamic provisioning allows efficiently allocate storage to hosts. It is more efficient than traditional provisioning.

Advantages of dynamic provisioning

  1. It dynamically manages data and physical capacity without frequent manual involvement
  2. Provides balanced resources and more optimized performance
  3. allows to create larger sized volumes
  4. Simplifies storage management

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