User Capacity (Logical Capacity); Table 12 Formula For Calculating User Capacity For Each Raid Level; Table 13 User Capacity Per Drive - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
RAID Functions

User Capacity (Logical Capacity)

User Capacity for Each RAID Level
The user capacity depends on the capacity of drives that configure a RAID group and the RAID level.
Table 12 shows the formula for calculating the user capacity for each RAID level.
Table 12 Formula for Calculating User Capacity for Each RAID Level
RAID level
RAID0
RAID1
RAID1+0
RAID5
RAID5+0
RAID6
RAID6-FR
*1: "N" is the number of RAID6 configuration sets. For example, if a RAID6 group is configured with "(3D+2P)´2+1HS", N is "2".
User Capacity of Drives
Table 13 shows the user capacity for each drive.
The supported drives vary depending on the model. For details on the drives, refer to
"Component" (page
Table 13 User Capacity per Drive
Product name (*1)
800GB SSD
960GB SSD
1.92TB SSD
3.84TB SSD
7.68TB SSD
15.36TB SSD
30.72TB SSD
300GB SAS disk
600GB SAS disk
900GB SAS disk
1.2TB SAS disk
1.8TB SAS disk
2.4TB SAS disk
4TB Nearline SAS disk
6TB Nearline SAS disk (*2)
8TB Nearline SAS disk (*2)
10TB Nearline SAS disk (*2)
12TB Nearline SAS disk (*2)
14TB Nearline SAS disk (*2)
Formula for user capacity calculation
Drive capacity ´ Number of drives
Drive capacity ´ Number of drives ¸ 2
Drive capacity ´ Number of drives ¸ 2
Drive capacity ´ (Number of drives - 1)
Drive capacity ´ (Number of drives - 2)
Drive capacity ´ (Number of drives - 2)
Drive capacity ´ (Number of drives - (2 ´ N) - Number of hot spares) (*1)
270).
User capacity
750,080MB
914,432MB
1,830,144MB
3,661,568MB
7,324,416MB
14,650,112MB
29,301,504MB
279,040MB
559,104MB
839,168MB
1,119,232MB
1,679,360MB
2,239,744MB
3,733,504MB
5,601,024MB
7,468,288MB
9,341,696MB
11,210,496MB
13,079,296MB
36
"■ Drives" (page 272) in
Design Guide