Chapter 5 Storage Manager
NAS Series User’s Guide
44
• External volumes (built on the external storage devices attached to the NAS)
Internal Volumes
RAID Types
The following table describes RAID types.
Note: RAID 5, RAID 6, RAID 10, and the hot spare option apply to 4-bay NAS devices.
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 Internal Storage screen’s Repair link to repair the volume.
Table 9 Internal Volumes
OPTION DESCRIPTION
Volume Allocates all the available space to the volume.
Provides better performance.
Volume on Disk
Group
Allows you to create multiple volumes on a disk group.
Allows you to customize the size of a volume.
Table 10 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)
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