Figure 23 FTV Configuration
SSD SAS disk Nearline SAS disk
FTSP (High tier) FTSP (Middle tier) FTSP (Low tier)
: RAID group
FTRP (Parent pool)
Chunk
Chunk
FTV
• Flexible Tier Pool (FTRP)
An FTRP is a management unit for FTSP to be layered. Up to three FTSPs can be registered in one FTRP. This
means that the maximum number of layers is three.
The priority orders can be set per FTSP within one FTRP. Frequently accessed data is stored in an FTSP with a
higher priority. Because FTSPs share resources with TPPs, the maximum number of FTSPs which can be created
is decreased when TPPs are created.
For data encryption, specify encryption for a pool when creating an FTRP or create an FTSP with a Self
Encrypting Drive (SED).
• Flexible Tier Sub Pool (FTSP)
An FTSP consists of one or more RAID groups. The FTSP capacity is expanded in 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 FTSPs that can be registered
in an
ETERNUS DX.
Table 33 The Maximum Number and the Maximum Capacity of FTSPs
Item DX100 S5 DX200 S5 DX500 S5 DX600 S5 DX900 S5
Maximum number of Flexible Tier Pools 30 30 60 64 64
Maximum number of Flexible Tier Sub Pools (*1) 72 132 256 256 256
Maximum capacity of the Flexible Tier Sub Pools
(*2)
4,096TB
(4PB)
6,144TB
(6PB)
16,384TB
(16PB)
24,576TB
(24PB)
131,072TB
(128PB)
Total capacity of the Flexible Tier Volumes (*3) 4,096TB
(4PB)
6,144TB
(6PB)
16,384TB
(16PB)
24,576TB
(24PB)
131,072TB
(128PB)
2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
67 Design Guide
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