AMCC 3WARE 9590SE Betriebsanweisung PDF herunterladen (Seite 24)

Chapter 1. Introduction to the 3ware Command Line Interface

18 3ware Serial ATA RAID Controller User Guide

Using Drive Capacity Efficiently

To make the most efficient use of drive capacity, it is advisable to use drives

of the same capacity in a unit. This is because the capacity of each drive is

limited to the capacity of the smallest drive in the unit.

The total unit capacity is defined as follows:

3RAID 0

RAID 1 with hot spare

RAID 5

4 RAID 5 with hot spare

RAID 10

Combination of RAID 0, RAID 1, single disk

5RAID 6

RAID 5 with hot spare

RAID 10 with hot spare

Combination of RAID 0, RAID 1, hot spare, single disk

6 or more RAID 6

RAID 6 with hot spare

RAID 50

Combination of RAID 0, 1, 5, 6,10, hot spare, single disk

Table 3: Possible Configurations Based on Number of Drives

# Drives Possible RAID Configurations

Table 4: Drive Capacity

RAID Level Capacity

Single Disk Capacity of the drive

RAID 0 (number of drives) X (capacity of the smallest drive)

RAID 1 Capacity of the smallest drive

RAID 5 (number of drives - 1) X (capacity of the smallest drive)

Storage efficiency increases with the number of disks:

storage efficiency = (number of drives -1)/(number of drives)

RAID 6 (number of drives - 2) x (capacity of the smallest drive)

RAID 10 (number of drives / 2) X (capacity of smallest drive)

RAID 50 (number of drives - number of groups of drives) X (capacity of the

smallest drive)

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 109 110

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AMCC 3WARE 9590SE Betriebsanweisung Seite 24