OpenEye GraniteRack 3U - Manual (Page 20)

Introduction
1-14
1.4.3.3 Online Capacity Expansion
Online Capacity Expansion makes it possible to add one or more physical
drive to a volume set, while the server is in operation, eliminating the need to
store and restore after reconfiguring the raid set. When disks are added to a
raid set, unused capacity is added to the end of the raid set. Data on the
existing volume sets residing on that raid set is redistributed evenly across all
the disks. A contiguous block of unused capacity is made available on the
raid set. The unused capacity can create additional volume set. The expan-
sion process is illustrated as following figure.
The RAID subsystem controller redistributes the original volume set over the
original and newly added disks, using the same fault-tolerance configuration.
The unused capacity on the expand raid set can then be used to create an
additional volume sets, with a different fault tolerance setting if user need to
change.