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Synology NAS User's Guide
Based on DSM 6.1
34 Chapter 6: Manage Storage Space with RAID Groups10F
Change RAID Types
The RAID types of existing RAID Groups can be changed without losing existing data, allowing you to easily and
economically manage storage capacity. To change the RAID type of a RAID Group, there must be available hard
disks installed in the Synology NAS. The table below displays supported types of RAID change. For more
detailed instructions regarding how to change RAID types, please refer to DSM Help.
RAID Type
Can be changed to…
Basic RAID 1 or RAID 5
RAID 1 RAID 5
RAID 5 RAID 6
RAID 1 Add mirror disk
Repair RAID Groups
When one of the hard disks belonging to a RAID Group fails, the RAID Group status will change
to Degraded. You can replace failed hard disks and repair the RAID Group, as long as the RAID Group is one of
the following RAID types: RAID 1, RAID 5, RAID 6, and RAID10.
For detailed instructions regarding how to repair RAID Groups, please refer to DSM Help.
Expand RAID Groups
The storage capacity of RAID Groups can be gradually expanded by installing more or larger hard disks. This
feature allows you to expand the capacity of your RAID Group according to your budget and with no need to
worry about losing any existing data.
The sections below provide basic information regarding expanding RAID Groups. For more detailed instructions,
please see DSM Help.
Expand RAID Groups by Installing Larger Hard Disks
You can expand the storage capacity of RAID Groups by replacing existing hard disks with larger ones. This
feature is available for following RAID 1, RAID 5, and RAID 6. Associated volumes or iSCSI LUN on RAID Group
for single volume or iSCSI LUN will be expanded automatically.
Expand RAID Groups by Installing Additional Hard Disks
You can expand the storage capacity of RAID Groups by installing and adding additional hard disks. This feature
is available for JBOD, RAID 5, and RAID 6.
For RAID Groups with total capacity less than 64TB, the system expands capacity automatically. For RAID
Groups with total capacity higher than 64TB, please click Manage > Expand to expand the capacity of your
RAID Group.
RAID/File System Scrubbing
RAID/file system scrubbing is a data maintenance function that inspects volumes or Disk Groups and repairs any
detected data inconsistencies. RAID scrubbing can be used with volumes or disk groups that implement SHR
(comprised of three or more disks), RAID 5, or RAID 6. File system scrubbing can be used with volumes in Btrfs
file system. We recommend regularly performing RAID/file system scrubbing in order to maintain data
consistency and avoid losing any critical data in the event of disk failure.
For detailed instructions regarding how to perform RAID/file system scrubbing, please refer to DSM Help.
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