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167

APPENDIX

In the illustration, volume 1 can be assigned a RAID level 5 of

operation while volume 0 might be assigned a RAID level 1E of

operation. Alternatively, the free space can be used to create vol-

ume 2, which could then be set to use RAID level 5.

Ease of Use Features

• Foreground Availability/Background Initialization

RAID 0 and RAID 1 volume sets can be used immediately after

creation because they do not create parity data. However, RAID

3, 5, 6, 30, 50 or 60 volume sets must be initialized to generate

parity information. In Background Initialization, the initializa-

tion proceeds as a background task, and the volume set is fully

accessible for system reads and writes. The operating system

can instantly access the newly created arrays without requir-

ing a reboot and without waiting for initialization to complete.

Furthermore, the volume set is protected against disk failures

while initialing. If using Foreground Initialization, the initializa-

tion process must be completed before the volume set is ready

for system accesses.

• Online Array Roaming

The SAS RAID controllers store RAID conguration information

on the disk drives. The controller therefore protects the con-

guration settings in the event of controller failure. Online array

roaming allows the administrators the ability to move a com-

plete RAID set to another system without losing RAID congura-

tion information or data on that RAID set. Therefore, if a server

fails, the RAID set disk drives can be moved to another server

with an Areca SAS/SATA RAID controllers and the disks can be

inserted in any order.

• Online Capacity Expansion

Online Capacity Expansion makes it possible to add one or more

physical drives to a volume set without interrupting server op-

eration, eliminating the need to backup and restore after recon-

guration of the RAID set. When disks are added to a RAID set,

unused capacity is added to the end of the RAID set. Then, data

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Datoptic ARC-1680 Series Manual do Utilizador Página 167