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tion and data on that raid set. If a server fails to work, the raid set disk drives
can be moved to another server and inserted in any order.
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.
1-15
Introduction
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