User Guide

RAID Type Count Disk Failure
Tolerance
Capacity Overview
JBOD (just
a bunch of
disks)
1 or more 0 Combined disk
capacity
• JBOD appends disks together in
a linear fashion. QTS writes data
to a disk until it is full, and then
writes to the next disk.
• JBOD allows all of the disks
capacity to be used.
• JBOD Single is not real RAID. It
does not provide any disk failure
protection or performance
benefits.
• JBOD is generally not
recommended. RAID 0 should be
used instead.
RAID 0 2 or more 0 Combined disk
capacity
• Disks are combined together
using striping.
• RAID 0 offers the fastest read/
write speeds and allows all disk
capacity to be used
• No disk failure protection. This
type should be paired with a data
backup plan.
RAID 1 2 1 Disk size divided by
2
• An identical copy of data is
stored on two disks.
• If either disk fails, data can still
be read from the other 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 or more 1 Total number of
disks minus 1 disk
• Data and parity information are
striped across all disks.
• The capacity of one disk is lost
for parity. This means that if any
one disk fails, it can be replaced
and the data on it can be
restored.
• Striping means read speeds are
increased with each additional
disk.
• Recommended for a good
balance between data protection
and speed.
QTS 4.3.4 Getting Started Guide
Storage & Snapshots 34