Highpoint RocketRAID 2320 User Manual download pdf (Page 8)

Foreground initialization

Foreground initialization will zero-out all data on the array. The array is not accessible

by the operating system until initialization is complete.

Background initialization

Background initialization allows the array to be used immediately. For RAID 1 and

RAID 10 arrays, initialization will results in data being duplicated identically to the

mirror pair. For RAID 5 arrays, initialization will result in parity being generated from

all array members.

Note: An un-initialized RAID 1 or RAID 10 array can still provide redundancy in

case of a disk failure. A RAID 5 array, however, is not fault-tolerant until initializa-

tion is finished.

Online Capacity Expansion (OCE)

This feature allows disks to be added to existing RAID arrays, in order to increase the

array’s capacity, without fear of data loss. Any number of disks can be added to an

array, at any time. Data can be accessed and utilized even while being redistributed.

Online RAID Level Migration

This term describes the ability to change one type of array (RAID level), into a

different type of array (changing a RAID 1 array into a RAID 10 array for example).

Data is still accessible during the migration process, and a base level of security is

still active.

OCE, ORLM and the RocketRAID 2320

The RocketRAID 2320 supports both Online Capacity Expansion (OCE), and Online

RAID Level Migration (ORLM). Both features are supported by a single function - an

array can be transformed from one RAID level to another RAID level while simulta-

neously being resized, even under I/O load.

Introduction

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Highpoint RocketRAID 2320 User Manual Page 8