QNAP TVS-472XT 4-Bay NAS Enclosure - Manual (Page 64)

RAID Type Number of
Disks
Disk Failure
Tolerance
Capacity Overview
JBOD (just a
bunch of
disks)
≥ 2 0 Total combined disk
capacity
• Combines disks together in a
linear fashion. QTS writes data to
a disk until it is full before writing
to the next disk.
• Uses the total capacity of all the
disks.
• Not a real RAID type. It provides
no disk failure protection or
performance benefits.
• Unless you have a specific reason
to use JBOD, you should use
RAID 0 instead.
RAID 0 ≥ 2 0 Total combined disk
capacity
• Disks are combined together
using striping.
• RAID 0 offers the fastest read
and write speeds, and uses the
total capacity of all the disks.
• Provides no disk failure
protection. This RAID type must
be paired with a data backup
plan.
• Recommended for high-
performance applications such
as video editing.
RAID 1 2 1 Half of the total
combined disk
capacity
• An identical copy of data is
stored on each disk.
• Half of the total disk capacity is
lost, in return for a high level of
data protection.
• Recommended for NAS devices
with two disks.
RAID 5 ≥ 3 1 Total combined disk
capacity minus 1
disk
• Data and parity information are
striped across all disks.
• The capacity of one disk is lost to
store parity information.
• Striping means read speeds are
increased with each additional
disk in the group.
• Recommended for a good
balance between data
protection, capacity, and speed.
QTS 4.4.x User Guide
Storage & Snapshots 63