Raid Group; Table 5 Raid Group Types And Usage - Fujitsu ETERNUS AF250 Design Manual

1. Function
RAID Functions

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
RAID group
REC Disk Buffer
Thin Provisioning
Pool (TPP) (*5)
Flexible Tier Sub
Pool (FTSP) (*6)
*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
*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
*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
*6: For details on the number of configuration drives for each RAID level and recommended configurations,
refer to Table
*7: Total of the Thin Provisioning Pool capacity and the FTSP capacity.
Usage
Areas to store normal data. Volumes (Standard, WSV,
SDV, SDPV) for work and Advanced Copy can be created
in a RAID group.
Areas that are dedicated for the REC Consistency mode to
temporarily back up copy data.
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.
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.
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FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
Maximum capacity
Per RAID group
Approximately 363TB
(*1)
Approximately 726TB
(*2)
Approximately 55TB
(*3)
Approximately 111TB
(*4)
2,048TB (*7)
23
Per storage system
Depends on the number
of installable drives
110TB (*3)
222TB (*4)
P3AG-1822-09ENZ0