Netgear RNRX443E – ReadyNAS 1500, 12TB NETWORK STORAGE (4 x 3 TB) Software Guide

Once synchronization completes, the data volume is redundant. This means that if one disk 
fails, the other disk contains all the data, so your are protected from a disk failure. 
Furthermore, X-RAID2supports multiple parity, which provides protection against two 
simultaneous disk failures. 

X-RAID2 does not replace backups. 

Easy Volume Expansion 

X-RAID2 supports both vertical and horizontal expansion. 

Horizontal expansion is the process of adding more disks to a ReadyNAS. 

Vertical expansion increases the volume capacity when higher capacity disks are installed in 
the ReadyNAS. You can take advantage of higher capacity, or more affordable disks to grow 
the size of a ReadyNAS volume by replacing a disk with a larger one, adding more disks, or 
both, as they become available. 

After the initialization process, the ReadyNAS synchronizes the new disk or disks, and 

assures data redundancy. This process can take 30 minutes to several hours, and occurs in 
the background, so you can continue using the ReadyNAS. Also, the synchronization 
process can also traverse system shutdowns. If you need to shut the system down while it is 
performing a synchronization, you can do so freely; when you restart the ReadyNAS, it 
resumes the synchronization.

Once completed, and there are a minimum of two disks with more capacity in the system, 
reboot the ReadyNAS to start the volume expansion, which occurs in the background. When 
the process completes, the data stored on the volume remains intact, but the volume 
capacity will have expanded to include the capacity of the new disk, less any additional 
overhead needed to assure the redundancy of the data on the volume.

You can expand the ReadyNAS volume repeatedly with additional disks and higher capacity 
disks, adding to the value of your investment in a ReadyNAS. For more information visit 

See 

48 for more information.