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Synology NAS User's Guide
Based on DSM 6.2
28 Chapter 5: Manage Storage Space
RAID Type HDD #
Allowed
Failed HDD #
Description Capacity
RAID 10
≧
4
(even
number)
1 HDD within
each RAID 1
group / Half of
the total HDD
RAID 10 has 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)
RAID F1
≧3
1
RAID F1 implements block-level striping with
parity data distributed across all member drives.
It writes more parity information on a certain
drive to prevent all of the drives from failing at
the same time. Recommended for an all-flash
array.
(HDD # – 1) x
(Smallest HDD
size)
Repair Storage Pools
The repair function is available for RAID 1, RAID 10, RAID 5, RAID 6, RAID F1, and SHR storage pools.
Depending on your RAID types, when one of the hard drives in the storage pool fails, the status of the storage
pool will change to degraded. You can repair the storage pool by replacing crashed drives to keep the data on
the storage pool protected. For more detailed instructions, please see DSM Help.
Change RAID Type
The RAID types of existing storage pools can be changed without losing existing data, allowing you to easily and
economically manage storage capacity. For example, you can create a RAID 1 volume on your Synology NAS,
and later change to RAID 5 if you install more hard drives.
The sections below provide basic information regarding changing RAID types. For more detailed instructions,
please see DSM Help.
Supported RAID Types
RAID types can be changed as follows.
RAID Type
Can be changed to...
Basic RAID 1, RAID 5
RAID 1 RAID 5
RAID 1 (Add mirror disks to RAID 1) RAID 1 (For increasing redundancy)
RAID 5 RAID 6
SHR-1 SHR-2
Hard Drive Requirements
In order to change the RAID type of a storage pool, there must be a sufficient number of available hard drives
installed in your Synology NAS. Please see below for the minimum number of hard drives required for each RAID
type.
RAID Type
Minimum Hard Drives
RAID 1 2 or 4
RAID 5 3
RAID 6 4
SHR-2 4 or 5 (depending on the drive constitution of SHR-1)
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