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Chapter 3: Creating and Configuring RAID Arrays

Configuring Logical Drives 3-11

3.2.2 Migrate

RAID Migration, such as migrating from RAID5 to RAID6, requires

additional disk capacity. The operational theory is described below:

1. Currently the RAID migration function supports the

migration between RAID5 and RAID6.

2. Before proceeding with RAID migration, make sure you

have sufficient free capacity or unused disk drives in your

RAID array. RAID6 arrays require at least four (4) member

drives and use additional capacity for the distribution of

secondary parity.

For example, if you want to migrate a RAID5 array

consisting of three (3) member drives to RAID6, one

additional disk drive must be added.

3. The differences between RAID5 and RAID6 arrays are

summarized as follows:

Table 3-3 RAID5 and RAID6 Comparison Chart

RAID5 RAID6

Min. No. of

Member Drives

3 4

Raw Capacity N x single disk size N x single disk size

Usable Capacity

N-1 (1 drive’s

capacity used for

storing parity data)

N-2 (2 drives’ capacity

used for storing parity

data); N>=4

If an individual disk capacity = 100G,

 The usable capacity of a 4-drive RAID5

= (4-1) x 100G = 300G

 The usable capacity of a 4-drive RAID6

= (4-2) x 100G = 200G

Redundancy Single disk drive

failure

2 disk drives to fail at

the same time

Exemplary Procedure

Step 1. Click on the “Migrate” function link on the navigation

panel to display the Migration screen.

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Rorke Data The Galaxy 65 Especificações Página 46