You can expand the storage capacity of an existing volume in two ways:
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Horizontal expansion. Expand the volume by adding more disks to the volume.
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Vertical expansion. Expand the volume by replacing disks in the volume with larger-capacity disks.
X-RAID2 makes horizontal volume expansion easy. If your X-RAID2 volume includes two or more disks, the volume expands automatically when you add disks.
You can expand a Flex-RAID volume by adding an additional JBOD disk or two additional RAID 0 disks.
Vertical expansion is available for X-RAID2 and Flex-RAID volumes.
You can continue to use your ReadyNAS system while the new disks are incorporated in the background. The process of volume expansion can take several hours. If you set up email notifications for your system, you receive an email message when the process finishes.
For more information on expanding the storage capacity of the volumes on your ReadyNAS storage system, please see the following support articles: