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2. Basic Functions
Operations Optimization (Deduplication/Compression and Storage Virtualization)
*2: The maximum pool capacity is the capacity that combines the FTSP capacity and the Thin Provisioning Pool capacity in the ETERNUS
AF. The maximum pool capacity of an FTRP is the same as the maximum pool capacity of a Flexible Tier Sub Pool.
*3: Same as the maximum capacity of the Flexible Tier Sub Pools. The actual maximum capacity varies depending on the physical capacity
that is configurable in the ETERNUS AF.
The RAID levels and the configurations, which can be registered in the FTSP, are the same as those of a TPP.
The following table shows the RAID configurations that can be registered in an FTSP.
Table 27
Levels and Configurations for a RAID Group That Can Be Registered in an FTSP
RAID level
RAID0
RAID1
RAID1+0
RAID5
RAID6
RAID6-FR
Flexible Tier Volume (FTV)
•
An FTV is a management unit of volumes to be layered. The maximum capacity of an FTV is 128TB. Note that
the total capacity of FTVs must be less than the maximum capacity of FTSPs.
When creating an FTV, the Allocation method can be selected.
-
Thin
When data is written from the host to an FTV, the physical area is allocated to a created virtual volume. 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 an FTV is created.
Perform a TPV/FTV capacity optimization if "Thick" has changed to "Thin". By optimizing the capacity, the area
that was allocated to an FTV is released and the FTV becomes usable. If a TPV/FTV capacity optimization is not
performed, the usage of the FTV does not change even after the Allocation method is changed.
The capacity of an FTV can be expanded after it is created.
For details on the number of FTVs that can be created, refer to
Number of configurable drives
4 (4D)
2 (1D+1M)
4 (2D+2M), 8 (4D+4M), 16 (8D+8M), 24 (12D+12M)
4 (3D+1P), 5 (4D+1P), 7 (6D+1P), 8 (7D+1P), 9 (8D+1P), 13 (12D+1P)
6 (4D+2P), 8 (6D+2P), 9 (7D+2P), 10 (8D+2P)
13 ((4D+2P) ´2+1HS), 17 ((6D+2P) ´2+1HS),
31 ((8D+2P) ´3+1HS), 31 ((4D+2P) ´5+1HS)
"Volume" (page
58
Recommended configurations
—
—
8 (4D+4M)
5 (4D+1P), 8 (7D+1P)
8 (6D+2P)
17 ((6D+2P) ´2+1HS)
27).
Design Guide
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