*1: The capacity of the product names for the drives is based on the assumption that 1MB = 1,000
2
bytes, while the user capacity for each
drive is based on the assumption that 1MB = 1,024
2
bytes. Furthermore, OS file management overhead will reduce the actual usable
capacity.
The user capacity is constant regardless of the drive size (2.5"/3.5"), the SSD type (Value SSD and SSD), or the encryption support (SED).
*2: For details on the RAID levels that can be configured with Nearline SAS disks that have 6TB or more, refer to "Supported RAID
" (page 33).
RAID Group
This section explains RAID groups.
A RAID group is a group of drives. It is a unit that configures RAID. Multiple RAID groups with the same RAID
level or multiple RAID groups with different RAID levels can be set together in the
ETERNUS DX. After a RAID
group is created, RAID levels can be changed and drives can be added.
Table 14 RAID Group Types and Usage
Type Usage
Maximum capacity
Per RAID group Per ETERNUS DX
RAID group Areas to store normal data. Volumes (Standard, WSV, SDV, SDPV)
for work and Advanced Copy can be created in a RAID group.
Approximately
324TB (*1)
Approximately
726TB (*2)
Depends on the
number of
installable drives
REC Disk Buffer
(*3)
Areas that are dedicated for the REC Consistency mode to
temporarily back up copy data.
Approximately
111TB (*4)
Approximately
222TB (*4)
Approximately
444TB (*5)
Thin Provisioning Pool
(TPP) (*6)
TPP is an area configured with RAID groups that are used for Thin
Provisioning. Thin Provisioning Volumes (TPVs) can be created in
a TPP.
2,048TB (DX60 S5) (*8)
4,096TB (DX100 S5
) (*8)
6,144TB (DX200 S5) (*8)
16,384TB (DX500 S5) (*8)
24,576TB (DX600 S5) (*8)
131,072TB (DX900 S5) (*8)
Flexible Tier Sub Pool
(FTSP) (*7)
FTSP is an area configured with RAID groups that are used for
Flexible Tier. Larger pools (Flexible Tier Pools: FTRPs) are
comprised by layers of FTSPs. Flexible Tier Volumes (FTVs) can be
created in an FTSP.
*1: This value is for a 14TB Nearline SAS disk RAID6-FR ((13D+2P)´2+1HS) configuration in the
ETERNUS DX60 S5.
For details on the number of configuration drives for each RAID level and recommended configurations, refer to Table 15.
*2: This value is for a 30.72TB SSD RAID6-FR ((13D+2P)´2+1HS) configuration in the
ETERNUS DX100 S5/DX200 S5 or ETERNUS DX500 S5/
DX600 S5/DX900 S5.
For details on the number of configuration drives for each RAID level and recommended configurations, refer to Table 15.
*3: This is not supported in the ETERNUS DX60 S5.
*4: This value is for a 30.72TB SSD RAID1+0 (4D+4M) configuration in the ETERNUS DX100 S5/DX200 S5 or the ETERNUS DX500 S5/DX600 S5.
*5: This value is for a 30.72TB SSD RAID1+0 (4D+4M) configuration in the ETERNUS DX900 S5.
*6: For details on the number of configuration drives for each RAID level and recommended configurations, refer to Table 29.
*7: For details on the number of configuration drives for each RAID level and recommended configurations, refer to Table 34.
*8: The maximum amount for the total of the Thin Provisioning Pool capacity and the FTSP capacity of the ETERNUS DX.
2. Basic Functions
RAID Functions
37 Design Guide
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