User manual

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RAID Groups
Users can expand a RAID group, add hard drive(s) to a RAID group, migrate a RAID group, configure a
spare drive, enable a bitmap and recover a RAID group for a chosen volume, while the data contained
in the RAID group remains intact. In this chapter, the following topics are covered:
 RAID Group Introduction
 Expanding RAID Group Capacity
 Adding Hard Disk Drives
 Migrating RAID Configuration
 Configuring Spare Drives
 Enabling/Disabling Bitmap
 Recovering Failed RAID Disk Volumes
RAID Group Introduction
RAID group types
Refer to the table below for explanations on RAID types:
Field
Description
Single Disk
A single, stand-alone RAID group can be set up for your NAS. However, this
setup does not provide any redundancy protection. So, in the event that a
disk is corrupted or otherwise damaged, all data on that disk will be lost.
RAID 0
Striping
A striping RAID group combines two or more disks into one large, logical
disk. It offers the fastest disk access performance but no data redundancy
protection in the event of disk failure or damage. The disk capacity is the
sum of all disks. Disk striping is usually used to maximize disk capacity or
to accelerate disk access speed. Please note that RAID 0 configuration is
not recommended for storing sensitive data.
RAID 1
Mirroring
Disk Mirroring protects your data by automatically mirroring the contents of
one disk to the second disk in the mirrored pair. It provides protection in
the event of a single disk failure. The storage capacity is equal to the
capacity of the smallest single disk, as the second disk drive is used to back
up the first disk drive. RAID 1 configuration is suitable for storing sensitive
data on a corporate or personal level.
RAID 5
RAID 5 configurations are ideal for organizations running databases and
other transaction-based applications that require storage efficiency and