ZyXEL NAS540 User Guide - Page 36

RAID Types, Repair Volumes or Disk Groups, Change RAID Type

Page 36 highlights

Chapter 4 Web Configurator Basics RAID Types Table 7 RAID Types RAID NO. OF TYPE HDD Basic 1 NO. OF HDD ALLOWED TO FAIL 0 JBOD 2-4 0 RAID 0 2-4 RAID 1 2-4 0 (No. of HDD) -1 RAID 5 3-4 1 RAID 6 4 RAID 10 4 2 1 HDD in each RAID 1 group DESCRIPTION CAPACITY Use Basic with one disk. It has no fault tolerance. Use JBOD with two or more disks for maximum capacity. This is just a collection of disks with no fault tolerance. Use RAID 0 with two or four disks for maximum speed and no fault tolerance. Use RAID 1 to create an exact copy of data on one disk to a second disk. Use this with two to four disks to mirror primary data to another disk(s) with high performance. You can add a hot spare to a 2-disk RAID 1. Use RAID 5 with three or four disks to balance performance and hard disk capacity usage with data protection in case of disk failure. You can add a hot spare to a 3-disk RAID 5. Use RAID 6 with four disks for more data protection in case of disk failure. Use RAID 10 with four disks to get better performance than RAID 6, with slightly less data protection. 1 x (HDD size) sum of HDD sizes sum of HDD sizes Smallest HDD size (No. of HDD - 1) x (smallest HDD size) (No. of HDD - 2) x (smallest HDD size) (No. of HDD / 2) x (smallest HDD size) Repair Volumes or Disk Groups If a hard disk in a RAID 1 with a hot spare or a RAID 5 with a hot spare fails, the NAS automatically uses the hot spare to re-build the volume or disk group. Later you can replace the failed hard disk and add the new disk as a hot spare. A hard disk failure in a RAID 1, RAID 5, RAID 6, or RAID 10 degrades the volume or disk group. Replace the failed disk and use the Storage screen's Repair link to repair the volume. Change RAID Type You can change the following RAID types without losing stored data. This can help you manage your storage capacity as you add more disks. Table 8 Internal Volumes RAID TYPE Basic RAID 1 RAID 5 WHAT YOU CAN CHANGE IT TO RAID 1 RAID 1 with a hot spare or RAID 5 RAID 5 with a hot spare or RAID 6 36 NAS540 User's Guide

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Chapter 4 Web Configurator Basics
NAS540 User’s Guide
36
RAID Types
Repair Volumes or Disk Groups
If a hard disk in a RAID 1 with a hot spare or a RAID 5 with a hot spare fails, the NAS automatically
uses the hot spare to re-build the volume or disk group. Later you can replace the failed hard disk
and add the new disk as a hot spare.
A hard disk failure in a RAID 1, RAID 5, RAID 6, or RAID 10 degrades the volume or disk group.
Replace the failed disk and use the
Storage
screen’s
Repair
link to repair the volume.
Change RAID Type
You can change the following RAID types without losing stored data. This can help you manage your
storage capacity as you add more disks.
Table 7
RAID Types
RAID
TYPE
NO. OF
HDD
NO. OF HDD
ALLOWED TO
FAIL
DESCRIPTION
CAPACITY
Basic
1
0
Use
Basic
with one disk. It has no fault
tolerance.
1 x (HDD size)
JBOD
2-4
0
Use
JBOD
with two or more disks for
maximum capacity. This is just a collection of
disks with no fault tolerance.
sum of HDD sizes
RAID 0
2-4
0
Use
RAID 0
with two or four disks for
maximum speed and no fault tolerance.
sum of HDD sizes
RAID 1
2-4
(No. of HDD) -1
Use
RAID 1
to create an exact copy of data
on one disk to a second disk. Use this with
two to four disks to mirror primary data to
another disk(s) with high performance.
You can add a hot spare to a 2-disk RAID 1.
Smallest HDD size
RAID 5
3-4
1
Use
RAID 5
with three or four disks to
balance performance and hard disk capacity
usage with data protection in case of disk
failure.
You can add a hot spare to a 3-disk RAID 5.
(No. of HDD – 1) x
(smallest HDD
size)
RAID 6
4
2
Use
RAID 6
with four disks for more data
protection in case of disk failure.
(No. of HDD – 2) x
(smallest HDD
size)
RAID 10
4
1 HDD in each
RAID 1 group
Use
RAID 10
with four disks to get better
performance than RAID 6, with slightly less
data protection.
(No. of HDD / 2) x
(smallest HDD
size)
Table 8
Internal Volumes
RAID TYPE
WHAT YOU CAN CHANGE IT TO
Basic
RAID 1
RAID 1
RAID 1 with a hot spare or RAID 5
RAID 5
RAID 5 with a hot spare or RAID 6