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 AF. After a RAID
group is created, RAID levels can be changed and drives can be added.
Table 5 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 726TB
(*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 111TB
(*4)
110TB (*3)
222TB (*4)
Thin Provisioning
Pool (TPP) (*5)
RAID groups that are used for Thin Provisioning in which
the areas are managed as a Thin Provisioning 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 Flexible Tier Sub Pool
(FTSP). Larger pools (Flexible Tier Pools: FTRPs) are com-
prised by layers of FTSPs. Flexible Tier Volumes (FTVs) can
be created in an FTSP.
*1: This value is for a 15.36TB SSD RAID6-FR ([13D+2P]´2+1HS) configuration in the
ETERNUS AF250.
For details on the number of configuration drives for each RAID level and recommended configurations,
refer to Table 6.
*2: This value is for a 30.72TB SSD RAID6-FR ([13D+2P]´2+1HS) configuration in the
ETERNUS AF250 S2.
For details on the number of configuration drives for each RAID level and recommended configurations,
refer to Table 6.
*3: This value is for a 15.36TB SSD RAID1+0 (4D+4M) configuration in the ETERNUS AF250.
*4: This value is for a 30.72TB SSD RAID1+0 (4D+4M) configuration in the ETERNUS AF250 S2.
*5: For details on the number of configuration drives for each RAID level and recommended configurations,
refer to Table 16.
*6: For details on the number of configuration drives for each RAID level and recommended configurations,
refer to Table 21.
*7: Total of the Thin Provisioning Pool capacity and the FTSP capacity.
1. Function
RAID Functions
23
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays
Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
P3AG-1822-09ENZ0
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