Volume; Figure 9 Volume Concept; Table 6 Recommended Number Of Drives Per Raid Group - Fujitsu ETERNUS DX60 S4 Design Manual

1. Function
RAID Functions
Table 6 shows the recommended number of drives that configure a RAID group.

Table 6 Recommended Number of Drives per RAID Group

RAID level
RAID1
RAID1+0
RAID5
RAID5+0
RAID6
RAID6-FR
*1: D = Data, M = Mirror, P = Parity, HS = Hot Spare
Sequential access performance hardly varies with the number of drives for the RAID group.
•
Random access performance tends to be proportional to the number of drives for the RAID group.
•
Use of higher capacity drives will increase the time required for the drive rebuild process to complete.
•
For RAID5, RAID5+0, and RAID6, ensure that a single RAID group is not being configured with too many
•
drives.
If the number of drives increases, the time to perform data restoration from parities and Rebuild/Copyback
when a drive fails also increases.
For details on the recommended number of drives, refer to
For details on the Thin Provisioning function and the RAID configurations that can be registered in Thin Pro-
•
visioning Pools, refer to
An assigned CM is allocated to each RAID group. For details, refer to
For the installation locations of the drives that configure the RAID group, refer to
Configurations" (page

Volume

This section explains volumes.
Logical drive areas in RAID groups are called volumes.
A volume is the basic RAID unit that can be recognized by the server.

Figure 9 Volume Concept

A volume may be up to 128TB. However, the maximum capacity of volume varies depending on the OS of the
server.
FUJITSU Storage ETERNUS DX60 S4, ETERNUS DX60 S3 Hybrid Storage Systems Design Guide (Basic)
Number of configura-
Recommended number of drives (*1)
tion drives
2 2(1D+1M)
4 to 32 4(2D+2M), 6(3D+3M), 8(4D+4M), 10(5D+5M)
3 to 16 3(2D+1P), 4(3D+1P), 5(4D+1P), 6(5D+1P)
3(2D+1P) ´ 2, 4(3D+1P) ´ 2, 5(4D+1P) ´ 2, 6(5D+1P) ´ 2
6 to 32
5 to 16 5(3D+2P), 6(4D+2P), 7(5D+2P)
11 to 31 17 ((6D+2P) ´2+1HS)
"Storage Capacity Virtualization" (page
137).
Volume 1
Volume 2
RAID group 1
Copyright 2019 FUJITSU LIMITED
Table 6.
36).
"Assigned CMs" (page
22
81).
"Recommended RAID Group
Volume 3
RAID group 2
P3AM-8992-14ENZ0