HighPoint RocketRAID 2240 - Manual (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 RAID1 and
RAID10 arrays, initialization will results in data being duplicated identically to the
mirror pair. For RAID5 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 RAID5 array, however, is not fault-tolerant until initialization 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 2240
The RocketRAID 2240 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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