Operations Optimization (Virtualization); Thin Provisioning; Figure 20 Storage Capacity Virtualization - Fujitsu ETERNUS DX60 S4 Design Manual

1. Function

Operations Optimization (Virtualization)

Operations Optimization (Virtualization)
A single controller configuration differs from a dual controller configuration in the following ways:
The Thin Provisioning function cannot be used.
•

Thin Provisioning

The Thin Provisioning function has the following features:
Storage Capacity Virtualization
•
The physical storage capacity can be reduced by allocating the virtual drives to a server, which allows efficient
use of the storage capacity. The volumes more than the capacity of all the installed drives can be allocated by
setting the capacity required for virtual volumes in the future.
TPV Balancing
•
I/O access to the virtual volume can be distributed among the RAID groups in a pool, by relocating and balanc-
ing the physical allocation status of the virtual volume.
TPV Capacity Optimization (Zero Reclamation)
•
Data in physically allocated areas are checked in blocks and unnecessary areas (areas where 0 is allocated to
all of the data in each block) are released to unallocated areas.
Storage Capacity Virtualization
Thin Provisioning improves the usability of the drives by managing the physical drives in a pool, and sharing the
unused capacity among the virtual volumes in the pool. The volume capacity that is seen from the server is vir-
tualized to allow the server to recognize a larger capacity than the physical volume capacity. Because a large
capacity virtual volume can be defined, the drives can be used in a more efficient and flexible manner.
Initial cost can be reduced because less drive capacity is required even if the capacity requirements cannot be
estimated. The power consumption requirements can also be reduced because a fewer number of drives are in-
stalled.

Figure 20 Storage Capacity Virtualization

Management server
FUJITSU Storage ETERNUS DX60 S4, ETERNUS DX60 S3 Hybrid Storage Systems Design Guide (Basic)
Virtual volume
Write
Mapping
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Data that is
actually used
Allocated
Allocated as required
36
Physical drives
RAID group
P3AM-8992-14ENZ0