Raid; 2Big Network Raid Modes - LaCie 301421U - 2big Network NAS Server User Manual

LaCie 2big Network
User Manual

5. RAID

5.1. 2big Network RAID Modes

The LaCie 2big Network supports two RAID
modes, Big (Concatenation) and Safe 100 (RAID 1).
This section will help you decide which mode is right
for your application.
Big (Concatenation)
■
In Big mode, the two physical disks are combined
(concatenation) so that one single yet larger logical vol-
ume mounts on the desktop, offering maximum possible
capacity (the available capacities of each disk are cumu-
lated). If one physical disk fails, the data of both disks
become inaccessible.
One Big volume
disk 1 disk 2
disk 1
disk 1 disk 2
TeChNICAl NOTe:
ing upon RAID mode.
Big = total accessible capacity
❖
Safe 100 (RAID 1) = 50% capacity
❖
Safe 100 (RAID 1)
■
In Safe 100 mode, the two physical disks are
mirrored together (RAID 1) so that one single logical
volume mounts on the desktop.
All of the data (100%) are saved simultaneously
on each disk (the available capacity cannot exceed the
available capacity of the lowest-capacity single disk). If
one physical disk fails, the data are available immediately
on the second disk.
When a drive is replaced after a drive failure, a
rebuild begins automatically. All data are copied from
the existing drive to the new drive. See section
Replacing Drives.
disk 1
One Safe volume
disk 2
disk 1
page 
Capacity varies depend-
disk 2
disk 1 disk 2
disk 2
raId
5.3,
disk 1 dis
disk 1 disk