User Capacity Of Drives; User Capacity For Each Raid Level; Table 4.6 User Capacity Per Drive; Table 4.7 Formula For Calculating User Capacity For Each Raid Level - Fujitsu ETERNUS DX80 S2 Overview

Chapter 4 System Configuration
4.4 Drives
4.4.1

User Capacity of Drives

Table 4.6 shows the user capacity for each drive.
Table 4.6 User capacity per drive
Product name (*1)
100GB SSD
200GB SSD
400GB SSD
800GB SSD
300GB SAS disk
450GB SAS disk
600GB SAS disk
900GB SAS disk
1TB Nearline SAS disk
2TB Nearline SAS disk
3TB Nearline SAS disk
4TB Nearline SAS disk
*1: The capacity that is listed above for the product names of the drives is based on the assumption that 1MB = 1,000
bytes, while the user capacity per drive is based on the assumption that 1MB = 1,024
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
RAID level
RAID0
RAID1
RAID1+0
RAID5
RAID5+0
RAID6
Formula for user capacity computation
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)
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ETERNUS DX80 S2/DX90 S2 Disk storage system Overview
Copyright 2013 FUJITSU LIMITED
User capacity
92,672MB
186,624MB
374,528MB
750,080MB
279,040MB
419,072MB
559,104MB
839,168MB
937,728MB
1,866,240MB
2,799,872MB
3,733,504MB
2
2
bytes. Furthermore, OS file
P3AM-4812-11ENZ0