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Synology NAS User's Guide
Based on DSM 6.1
33 Chapter 6: Manage Storage Space with RAID Groups10F
RAID Group Types
Your Synology NAS supports the following RAID Groups types:
RAID Group for Single Volume or iSCSI LUN (Block-Level)
Allocates all available capacity to a single volume or iSCSI LUN (Block-Level).
Provides better performance but less storage management flexibility.
Allows creation of multiple iSCSI LUNs (Regular File) on volumes.
Supports a maximum of one RAID Array.
RAID Group for Multiple Volumes or iSCSI LUNs (Block-Level)
Supports creating multiple volumes or iSCSI LUNs (Block-Level) on a RAID Group.
Provides better storage management flexibility.
Allows creation of multiple iSCSI LUNs (Regular File) on volumes.
Supports combining multiple RAID Arrays under a RAID Group (when configured as RAID 5 or RAID 6).
The maximum volume size that can be allocated is 200TB (when configured as RAID 5 or RAID 6, with at
least 32GB RAM installed).
RAID Types
Depending on the number of available hard disks, you can create RAID Groups using several different RAID
types. Different RAID types provide different levels of performance, data protection, and storage features.
Synology NAS supports the following RAID types
1
:
RAID Type HDD #
Allowed
Failed HDD #
Description Capacity
Basic 1 0 Creates a storage space with one hard disk. 1 x (HDD size)
JBOD
≧ 1
0
Combines multiple hard disks into a single, large
storage space.
Sum of all HDD
sizes
RAID 0 2-12 0
RAID 0 offers Striping, a process of dividing
data into blocks and spreading the data blocks
across several hard drives, but without safety
measures.
Sum of all HDD
sizes
RAID 1 2-4 (HDD #) - 1
Writes a mirrored copy of data to each hard
drive, providing data redundancy and protection
as long as one hard disk is operating normally.
Smallest HDD
size
RAID 5
3-12 per
RAID Array
1 HDD within
each RAID
Array
Stripes both data and parity information across
all member disks, providing data redundancy. If
one hard disk fails, the system may be rebuilt
using parity data from other member hard disks
Supports combining multiple RAID Arrays when
created on a RAID Group for Multiple Volumes
or iSCSI LUNs (Block-Level)
Total capacity of
combined RAID
Arrays.
RAID Array
capacity = (HDD
# - 1) x (Capacity
of smallest
HDD).
RAID 6
4-12 per
RAID Array
2 HDD within
each RAID
Array
RAID 6 provides extra data protection. It uses
parity mode to store redundant data on space
equal to the size of two disks for later data
recovery.
Supports combining multiple RAID Arrays when
created on a RAID Group for Multiple Volumes
or iSCSI LUNs (Block-Level)
Total capacity of
combined RAID
Arrays.
RAID Array
capacity =
(HDD# - 2) x
(Capacity of
smallest HDD)
RAID 10
4-12 per
RAID Array
(even
number)
1 HDD within
each RAID 1
group / Half of
the total HDD
Provides the performance of RAID 0 and data
protection level of RAID 1. RAID 10 combines
two hard drives into a RAID 1 group, and
combines all the groups with RAID 0.
(HDD # / 2) x
(Smallest HDD
size)
---------
1
Synology Hybrid RAID (SHR) is not supported on models with RAID Groups.
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