Areca ARC-1280ML Manual de usuario descargar pdf (Pagina 165)

165

APPENDIX

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

operation while volume 0 might be assigned a RAID level 10 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 af-

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

RAID 3, 5 and 6 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 SATA RAID controllers store RAID conguration information

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

ration settings in the event of controller failure. Array roaming

allows the administrators the ability to move a completed 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 controller 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-1280ML Manual de usuario Pagina 165