HighPoint RocketRAID 2522 - Manual (Page 9)

Introduction
Array initialization
A redundant array (RAID5, RAID1, RAID10, RAID50) needs to be initialized to ensure
full performance and reliability. Non-redundant arrays (RAID0, JBOD) do not need to
be initialized.
When you create a redundant array using the RocketRAID 2522 controller’s BIOS
Configuration Utility, it will create the array in un-initialized state. The initialization
process can be completed after installing the driver and management software.
When creating an array using the HighPoint RAID Management Console software,
you can specify an initialization option (Skip initialization, foreground and
background).
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 RAID1 and
RAID10 arrays, initialization will results in data being duplicated identically to the
mirror pair. For RAID(5, 50) arrays, initialization will result in parity being generated from
all array members.
Note: An un-initialized RAID1 or RAID10 array can still provide redundancy in case
of a disk failure. A RAID (5, 50) array is not fault-tolerant until initialization is complete.
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.
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