Areca ARC-1213-4I Bedienungsanleitung PDF herunterladen (Seite 182)

APPENDIX

182

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

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 complete RAID

set to another system without losing RAID conguration infor-

mation 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 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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Areca ARC-1213-4I Bedienungsanleitung Seite 182