User manual

INTRODUCTION

1.3.3.3 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 reconﬁgured 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 expansion process is illustrated as following ﬁgure.

The SATA RAID 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.