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 6 RAID Group Types and Usage
Type Usage
Maximum capacity
Per RAID group Per storage system
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 363TB
(*1)
Approximately 711TB
(*2)
Depends on the
number of installable
drives
REC Disk Buffer Areas that are dedicated for the REC Consistency
mode to temporarily back up copy data.
Approximately 55TB
(*3)
Approximately 109TB
(*4)
110TB (*3) (*8)
218TB (*4)
(*9)
Thin Provision-
ing Pool (TPP)
(*5)
RAID groups that are used for Thin Provisioning in
which the areas are managed as a Thin Provision-
ing Pool (TPP). Thin Provisioning Volumes (TPVs)
can be created in a TPP.
2,048TB (*7)
Flexible Tier
Sub Pool (FTSP)
(*6)
RAID groups that are used for the Flexible Tier
function in which the areas are managed as a Flex-
ible Tier Sub Pool (FTSP). Larger pools (Flexible
Tier Pools: FTRPs) are comprised by layers of
FTSPs. Flexible Tier Volumes (FTVs) can be cre-
ated in an FTSP.
*1 : This value is for a 15.36TB SSD RAID6-FR ([13D+2P]´2+1HS) configuration in the
ETERNUS
DX100 S3/DX200 S3.
For details on the number of configuration drives for each RAID level and recommended con-
figurations, refer to Table 7.
*2: This value is for a 30.72TB SSD RAID6-FR ([13D+2P]´2+1HS) configuration in the
ETERNUS
DX100 S4/DX200 S4.
For details on the number of configuration drives for each RAID level and recommended con-
figurations, refer to Table 7.
*3: This value is for a 15.36TB SSD RAID1+0 (4D+4M) configuration in the ETERNUS DX100 S3/
DX200 S3.
*4: This value is for a 30.72TB SSD RAID1+0 (4D+4M) configuration in the ETERNUS DX100 S4/
DX200 S4
.
*5: For details on the number of configuration drives for each RAID level and recommended con-
figurations, refer to Table 14.
*6: For details on the number of configuration drives for each RAID level and recommended con-
figurations, refer to Table 19.
*7: Total of the Thin Provisioning Pool capacity and the FTSP capacity.
*8: The maximum capacity of an ETERNUS DX100 S3/DX200 S3 with one controller is 55TB.
*9: The maximum capacity of an ETERNUS DX100 S4/DX200 S4 with one controller is 109TB.
2. Basic Functions
RAID Functions
24
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems
Design Guide (Basic)
Copyright 2023 Fujitsu Limited
P3AM-7642-32ENZ0
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