*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. The maximum pool capacity of an FTRP is the same as the maximum
pool capacity of a Flexible Tier Sub Pool.
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 19 Levels and Configurations for a RAID Group That Can Be Registered in a FTSP
RAID level
Number of configurable drives
Recommended config-
urations
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)
•
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 vol-
umes 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
●
Threshold Monitoring of Used Capacity
When the used capacity of an FTRP or an FTV reaches the threshold, an alarm notification can be sent from ETER-
NUS SF Storage Cruiser. There are two types of thresholds: "Attention" and "Warning". A different value can be
specified for each threshold type.
Make sure to add drives before free space in the FTRP runs out, and add FTSP capacity from ETERNUS SF Storage
Cruiser.
2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
52
FUJITSU Storage ETERNUS DX500 S4/DX600 S4, ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
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