HP Smart Array P731m Controller - Manual (Page 29)

Drive procedures 29
The expansion process is illustrated in the following figure, in which the original array (containing data) is
shown with a dashed border, and the newly added drives (containing no data) are shown unshaded. The
array controller adds the new drives to the array and redistributes the original logical drives over the
enlarged array one logical drive at a time. This process liberates some storage capacity on each physical
drive in the array. Each logical drive keeps the same fault-tolerance method in the enlarged array that it had
in the smaller array.
When the expansion process has finished, you can use the liberated storage capacity on the enlarged array
to create new logical drives. Alternatively, you can use HP SSA to enlarge (extend) one of the original logical
drives.