Figure 62 Raid Configuration Example (When 12 Ssds Are Installed); Table 55 Guideline For The Number Of Drives And User Capacities (When 1.2Tb Sas Disks Are Installed) - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
Smart Setup Wizard
Number of
installed drives
48
Figure 62
RAID5 × 2, Hot spare × 1, Unused drive × 1
Drive#0
Drive#5
*1: The capacity of the user data area is equivalent to four drives.
●
For SAS Disks, SAS SEDs, Nearline SAS Disks, Nearline SAS SEDs
RAID groups are created with RAID6, which has high storage efficiency.
Table 55 shows a guideline for the number of drives and user capacities when 1.2TB SAS disks are installed
and Figure 63
Table 55 Guideline for the Number of Drives and User Capacities (When 1.2TB SAS Disks Are Installed)
Number of
installed drives
6 or less
7
8
9
10
11
12
13
RAID configuration that is to be
created
Capacity of the
user data area
RAID group (equivalent
number of
drives)
RAID5 ´ 5
40
RAID Configuration Example (When 12 SSDs Are Installed)
RAID5 group 1 (*1)
Drive#1 Drive#2 Drive#3
RAID5 group 2 (*1)
Drive#6 Drive#7 Drive#8
shows an example RAID configuration.
RAID configuration that is to be
created
Capacity of the
user data area
RAID group (equivalent
number of
drives)
RAID groups -
cannot be
created
RAID6 ´ 1
4
RAID6 ´ 1 4
RAID6 ´ 1
6
RAID6 ´ 1
7
RAID6 ´ 1
8
RAID6 ´ 1
8
RAID6 ´ 2 8
Hot spare Unused drive
1 2
Hot spare
Drive#4 Drive#10
Drive#9
Hot spare Unused drive
- -
1 0
1 1
1 0
1 0
1 0
1 1
1 0
125
User capacity
Per RAID group Per ETERNUS DX
Approx. 13.9TB Approx. 69.8TB
Unused drive
Drive#11
User capacity
Per RAID group Per ETERNUS DX
- -
Approx. 4.2TB Approx. 4.2TB
Approx. 4.2TB Approx. 4.2TB
Approx. 6.4TB Approx. 6.4TB
Approx. 7.4TB Approx. 7.4TB
Approx. 8.5TB Approx. 8.5TB
Approx. 8.5TB Approx. 8.5TB
Approx. 4.2TB Approx. 8.5TB
Design Guide