HP NetStorage 6000 - Manual (Page 15)

Overview
HP NetStorage 6000 Hardware
1-8
Hot Spare Drives
Hot spare drives are reserved drives that are used only when a physical
drive that is part of a logical drive fails. When this happens, the system
automatically selects the first available hot spare drive to take the place of
the failed drive as shown in figure 1.5. The logical drive is rebuilt using the
hot spare, and the hot spare drive becomes a member of the logical drive.
Figure 1.5 Hot Spare Drive
It is important to note that a hot spare must have the same or larger capacity
of the physical drive it is to replace. The system will not select a hot spare
to replace a failed drive if the capacity of the hot spare is less than the drive
it is to replace.
Once a hot spare is used to repair a logical drive, its assignment changes
from Hot Spare to Online. If you replace the failed drive, it automatically
receives an assignment of Unassigned. You must manually assign the new
drive to Hot Spare if the new drive is to serve as a hot spare.
Redundant Power Supply Modules
A redundant power supply module is installed in the back of the HP
NetStorage 6000. Three power-supply modules are active but only two are
necessary to power a fully loaded unit. If a power supply module fails, the
redundant supply provides power to the unit.