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 Formula for user capacity calculation
RAID0
Drive capacity ´ Number of drives
RAID1
Drive capacity ´ Number of drives ¸ 2
RAID1+0
Drive capacity ´ Number of drives ¸ 2
RAID5
Drive capacity ´ (Number of drives - 1)
RAID5+0
Drive capacity ´ (Number of drives - 2)
RAID6
Drive capacity ´ (Number of drives - 2)
RAID6-FR
Drive capacity ´ (Number of drives - (2 ´ N) - Number of hot spares) (*1)
*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 "■ Drives" (page 272) in
"Component" (page 270).
Table 13 User Capacity per Drive
Product name (*1) User capacity
800GB SSD 750,080MB
960GB SSD 914,432MB
1.92TB SSD 1,830,144MB
3.84TB SSD 3,661,568MB
7.68TB SSD 7,324,416MB
15.36TB SSD 14,650,112MB
30.72TB SSD 29,301,504MB
300GB SAS disk 279,040MB
600GB SAS disk 559,104MB
900GB SAS disk 839,168MB
1.2TB SAS disk 1,119,232MB
1.8TB SAS disk 1,679,360MB
2.4TB SAS disk 2,239,744MB
4TB Nearline SAS disk 3,733,504MB
6TB Nearline SAS disk (*2) 5,601,024MB
8TB Nearline SAS disk (*2) 7,468,288MB
10TB Nearline SAS disk (*2) 9,341,696MB
12TB Nearline SAS disk (*2) 11,210,496MB
14TB Nearline SAS disk (*2) 13,079,296MB
2. Basic Functions
RAID Functions
36 Design Guide
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