Fujitsu Eternus DX80 S2 - Figure; Table 4.6 User Capacity Per Drive; Table 4.7 Formula for Calculating User Capacity for each RAID Level; User Capacity for each RAID Level

Chapter 4 System Configuration
4.4 Drives
ETERNUS DX80 S2/DX90 S2 Disk storage system Overview
Copyright 2013 FUJITSU LIMITED P3AM-4812-11ENZ0
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4.4.1 User Capacity of Drives
Table 4.6 shows the user capacity for each drive.
Table 4.6 User capacity per drive
*1: The capacity that is listed above for the product names of the drives is based on the assumption that 1MB = 1,000
2
bytes, while the user capacity per drive is based on the assumption that 1MB = 1,024
2
bytes. Furthermore, OS file
management overhead will reduce the actual usable capacity.
The user capacity does not change even when the drive sizes (2.5"/3.5") are different, or whether or not the drive is
encryption-compliant (SED).
4.4.2 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 4.7
shows the formula for calculating the user capacity for each RAID level.
Table 4.7 Formula for calculating user capacity for each RAID level
Product name (*1) User capacity
100GB SSD 92,672MB
200GB SSD 186,624MB
400GB SSD 374,528MB
800GB SSD 750,080MB
300GB SAS disk 279,040MB
450GB SAS disk 419,072MB
600GB SAS disk 559,104MB
900GB SAS disk 839,168MB
1TB Nearline SAS disk 937,728MB
2TB Nearline SAS disk 1,866,240MB
3TB Nearline SAS disk 2,799,872MB
4TB Nearline SAS disk 3,733,504MB
RAID level Formula for user capacity computation
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)