Figure 20 Storage Capacity Virtualization; Table 12 Tpp Maximum Number And Capacity - Fujitsu ETERNUS DX100 S4 Design Manual

2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
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 virtualized to allow the server to recognize a larger capacity than the physi-
cal 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 installed.

Figure 20 Storage Capacity Virtualization

Management server
In the Thin Provisioning function, the RAID group, which is configured with multiple drives, is man-
aged as a Thin Provisioning Pool (TPP). When a Write request is issued, a physical area is allocated
to the virtual volume. The free space in the TPP is shared among the virtual volumes which belong
to the TPP, and a virtual volume, which is larger than the drive capacity in the ETERNUS DX, can be
created. A virtual volume to be created in a TPP is referred to as a Thin Provisioning Volume (TPV).
Thin Provisioning Pool (TPP)
•
A TPP is a physical drive pool which is configured with one or more RAID groups. TPP capacity
can be expanded in the units of RAID groups. Add RAID groups with the same specifications
(RAID level, drive type, and number of member drives) as those of the existing RAID groups.
The following table shows the maximum number and the maximum capacity of TPPs that can be
registered in the ETERNUS DX.

Table 12 TPP Maximum Number and Capacity

Item
Number of pools
(max.)
Pool capacity (max.)
*1 : The maximum total number of Thin Provisioning Pools and FTSPs.
*2: The maximum pool capacity is the capacity that combines the FTSP capacity and the Thin
Provisioning Pool capacity in the ETERNUS DX.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
Virtual volume
Write
Mapping
ETERNUS DX100 S4/DX100 S3
72 (*1)
2,048TB (*2)
Copyright 2023 Fujitsu Limited
Data that is
actually used
Allocated
Allocated as required
ETERNUS DX200 S4/DX200 S3
132 (*1)
42
Physical drives
RAID group
P3AM-7642-32ENZ0