The following table shows the TPP chunk size that is applied when TPPs are created.
Table 28
Chunk Size According to the Configured TPP Capacity
Setting value of the maximum pool capacity
Chunk size (*1)
DX60 S5
DX100 S5
DX200 S5
DX500 S5
DX600 S5
DX900 S5
Up to 128TB
Up to 256TB
Up to 384TB
Up to 1,024TB
Up to 1,536TB
Up to 8,192TB
21MB
2,048TB
(2PB)
4,096TB
(4PB)
6,144TB
(6PB)
16,384TB
(16PB)
24,576TB
(24PB)
131,072TB
(128PB)
336MB
*1:
Chunk size is for delimiting data. The chunk size is automatically set according to the maximum pool capacity.
To perform encryption, specify encryption by firmware when creating a TPP, or select the Self Encrypting Drive
(SED) for configuration when creating a TPP.
The following table shows the RAID configurations that can be registered in a TPP.
Table 29
Levels and Configurations for a RAID Group That Can Be Registered in a TPP
RAID level
Number of configurable drives
Recommended configurations
RAID0
4 (4D)
—
RAID1
2 (1D+1M)
2 (1D+1M)
RAID1+0
4 (2D+2M), 8 (4D+4M), 16 (8D+8M), 24 (12D+12M)
8 (4D+4M)
RAID5
4 (3D+1P), 5 (4D+1P), 7 (6D+1P), 8 (7D+1P), 9 (8D+1P), 13 (12D+1P)
4 (3D+1P), 8 (7D+1P)
RAID6
6 (4D+2P), 8 (6D+2P), 9 (7D+2P), 10 (8D+2P)
8 (6D+2P)
RAID6-FR
13 ((4D+2P)
´
2+1HS), 17 ((6D+2P)
´
2+1HS)
31 ((8D+2P)
´
3+1HS), 31 ((4D+2P)
´
5+1HS)
17 ((6D+2P)
´
2+1HS)
•
Thin Provisioning Volume (TPV)
The maximum capacity of a TPV is 128TB. Note that the total TPV capacity must be smaller than the maximum
capacity of the TPP.
When creating a TPV, the Allocation method can be selected.
-
Thin
When data is written from the host to a TPV, a physical area is allocated to the created virtual volume. The
allocated capacity size (chunk size) is the same as the chunk size of the TPP specified when a TPV is created.
The physical storage capacity can be reduced by allocating a virtualized storage capacity.
-
Thick
When creating a volume, the physical area is allocated to the entire volume area. This can be used for
volumes in the system area to prevent a system stoppage due to a pool capacity shortage during operations.
In general, selecting "Thin" is recommended. The Allocation method can be changed after a TPV is created.
Perform a TPV/FTV capacity optimization if "Thick" has changed to "Thin". By optimizing the capacity, the area
that was allocated to a TPV is released and the TPV becomes usable. If a TPV/FTV capacity optimization is not
performed, the usage of the TPV does not change even after the Allocation method is changed.
The capacity of a TPV can be expanded after it is created.
For details on the number of TPVs that can be created, refer to
2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
60
Design Guide
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