LaCie Two Big eSATA & USB
User Manual
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7.3. Big (Concatenation)
Maximum Capacity Solution
A concatenated volume, or concatenation, is a
volume whose data is organized serially and adjacently
across components, forming one logical storage unit. If
you have 3 6GB disks in a concatenation, you’ll have one
18G virtual disk. You’ll write data to the first drive until
it fills, then fill the second, etc (Fig. 7.3.A.).
A concatenation enables you to dynamically expand
storage capacity and file system sizes online. With a
concatenation you can add components even if the other
components are currently active.
Characteristics and Advantages
In case of disc failure, other disks are unaffected.
Combine the capacities of two drives into one
large volume.
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❖
Disk A
CONTROLLER
Disk B
Fig. 7.3.A.
7.4. JBOD
Just a Bunch of Disks
JBOD, or Just a Bunch of Disks, is not a numbered
RAID level. However, it is similar because it is an Array
of Inexpensive Disks.
In a JBOD configuration, each connected drive will
appear as separate hardware entries in the computer’s
drive utility software. A JBOD array is the simplest
storage policy available to the Two Big but provides no
data redundancy (Fig. 7.4.A.).
CONTROLLER
Disk B
Disk A
Fig. 7.4.A.
Understanding RAID and Storage Policies
