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Synology NAS User's Guide
Based on DSM 6.2
29 Chapter 5: Manage Storage Space
Expand Volumes and Storage Pools
The storage capacity of volumes and storage pools can be gradually expanded by installing more or larger hard
drives. This feature allows you to expand the capacity of your volume and storage pool according to your budget
and with no need to worry about losing any existing data.
The sections below provide basic information regarding expanding volumes and storage pools. For more detailed
instructions, please see DSM Help.
Expand a Volume
For a volume created on a storage pool with multiple volume support (higher flexibility), if the underlying storage
pool has enough capacity, you can expand the volume directly by changing its size. For a volume created on a
storage pool without multiple volume support, you need to expand the underlying storage pool first. For more
detailed instructions, please see DSM Help.
Expand a Storage Pool by Replacing Drives
For SHR, RAID 1, RAID 5, RAID 6, RAID 10, and RAID F1, the storage capacity of storage pools can be
expanded by replacing smaller hard drives with larger ones. When expanding storage capacity with this method,
please carefully replace each hard drive one-by-one. After replacing one hard drive, the storage pool must be
repaired before the next hard drive is replaced. For more detailed instructions, please see DSM Help.
Please see the following table to see which hard drive should be replaced first.
RAID Type
Notes
SHR (Synology Hybrid RAID)
If the capacity of all member hard drives is equal, then you
should replace at least two hard drives. Otherwise, the
capacity of your storage pool will not expand.
If the capacity of member hard drives is different, then the
new, replacement hard drives should be equal to or larger
than the largest existing hard drive. In addition, you should
replace smaller member hard drives first in order to
optimize capacity usage.
RAID 1, RAID 5, RAID 6, RAID 10
When replacing hard drive of storage pools in these RAID
types, the smallest drive should always be replaced first in
order to maximize drive usage.
Expand a Storage Pool by Adding Drives
For SHR, JBOD, RAID 5, RAID 6, and RAID F1, the storage capacity of storage pools can be expanded by
adding more hard drives if there are empty hard drive bays in your Synology NAS. For more detailed instructions,
please see DSM Help.
Please see the following table regarding the minimum size of new hard drives.
RAID Type
Minimum Hard Drive Size
SHR
The capacity of the drive you wish to add must be equal to
or larger than the largest drive in the storage pool, or be
equal to any of the drives in the storage pool. For example,
if your SHR volume is composed of three drives – 2 TB, 1.5
TB, and 1 TB, respectively – then the capacity of the new
drive must be at least 2 TB or equal to 1.5 TB or 1 TB.
RAID 5, RAID 6, RAID F1
The capacity of the drive you wish to add must be equal to
or larger than the smallest drive in the storage pool. For
example, if your volume is composed of three drives – 2
TB, 1.5 TB, and 1 TB, respectively – then the capacity of
the new drive must be at least 1 TB.
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