HP Smart Array P700m Controller - Manual (Page 26)

Replacing, moving, or adding hard drives 26
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 ACU to enlarge (extend) one of the original
logical drives.