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 8
RAID Group Types and Usage
Type
Usage
Maximum capacity
Per RAID group
Per ETERNUS AF
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
62TB (*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
13TB (*3)
Approximately
111TB (*4)
Approximately
26TB (*3)
Approximately
222TB (*4)
Thin Provisioning Pool
(TPP) (*5)
TPP is an area configured with RAID groups that are used for Thin
Provisioning. Thin Provisioning Volumes (TPVs) can be created in
a TPP.
4,096TB (AF150 S3) (*7)
6,144TB (AF250 S3) (*7)
24,576TB (AF650 S3) (*7)
Flexible Tier Sub Pool
(FTSP) (*6)
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 3.84TB SSD RAID6-FR ((9D+2P)
´
2+1HS) configuration in the ETERNUS AF150 S3.
For details on the number of configuration drives for each RAID level and recommended configurations, refer to
.
*2:
This value is for a 30.72TB SSD RAID6-FR ((13D+2P)
´
2+1HS) configuration in the ETERNUS AF250 S3 or ETERNUS AF650 S3.
For details on the number of configuration drives for each RAID level and recommended configurations, refer to
.
*3:
This value is for a 3.84TB SSD RAID1+0 (4D+4M) configuration in the ETERNUS AF150 S3.
*4:
This value is for a 30.72TB SSD RAID1+0 (4D+4M) configuration.
*5:
For details on the number of configuration drives for each RAID level and recommended configurations, refer to
.
*6:
For details on the number of configuration drives for each RAID level and recommended configurations, refer to
.
*7:
The maximum amount for the total of the Thin Provisioning Pool capacity and the FTSP capacity of the ETERNUS AF.
The same capacity drives and the same kind of drives (SSDs or SSD SEDs) must be used to configure a RAID
group.
Figure 3
Example of a RAID Group
SSD
960GB
SSD
960GB
SSD
960GB
SSD
960GB
SSD
960GB
SSD
1.92TB
SSD
1.92TB
SSD
1.92TB
SSD
1.92TB
RAID group 1
RAID group 2
2. Basic Functions
RAID Functions
25
Design Guide
Summary of Contents for ETERNUS AF S3 Series
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