What is hitachi dynamic provisioning?
Hitachi Dynamic Provisioning (HDP)
Dynamic provisioning in Hitachi VSP is works on concept of thin provisioning.
Hitachi Dynamic Provisioning (HDP) was introduced on the USP V/VM arrays. It provided a mechanism for grouping multiple RAID Groups of one RAID type and one disk type into a single Pool which is DP pool. Dynamic Provisioning Volumes (DPVOLs) are created with specified logical size (up to 60TB) on DP pool and present them to host.
The host accesses the DPVOL as if it was a normal volume. A major difference is that physical space is not allocated to a DPVOL until the host starts writes on the DPVOL. Whenever a host starts writing data in DPVOL (Thin Vol), data written into DP Pool and stripes across RAID groups of 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
- dynamically manage data and physical capacity without frequent manual involvement
- Provides balanced resources and more optimized performance
- allows to create larger sized volumes
- Simplifies storage management