HP StorageWorks XP12000 Disk Array Site Preparation Guide (AE002-96040, March 2008)

Uninterruptible power supply (UPS)
Most disk array units are installed in data centers where a UPS strategy is already in place. However,
if you are making your first large disk array purchase, you may need a separate UPS solution.
CAUTION:
This section discusses a product UPS. If you are planning or already have a site-wide UPS, HP recommends
against using a product UPS powered by a site-wide UPS for the XP12000 disk array.
Make sure your UPS satisfies the requirements in Table 21. Table values are based on a worst-case
voltage (rated voltage –10 percent) and a maximum configuration of DKC/DKUs. A phase imbalance
of 15 percent is also included in the calculation.
Table 21 UPS requirements
Three-phase 30ASingle-phase 50ASingle-phase 30A
Input
(VAC)
Each DKUEach DKUDKCEach DKUDKC
20.0 A34.6 A40.0 A17.3 A20.0 A208
10.4 ANot applicableNot applicableNot applicableNot applicable400
In a maximum disk array configuration (one DKC and four DKUs), the array requires 31 kVA.
Sources of electrical interference
Ensure that the disk array is protected from the sources of electrical interference descibed in Table 22.
Table 22 Protecting against electrical interference
DescriptionPotential source
Convenience power outlets for building maintenance equipment (such
as vacuum cleaners and floor buffers) must be wired from circuit
breakers on a power panel separate from the computer system panel.
The ground wires from these outlets must be connected to the normal
building distribution panel and not to the system ground. If a separate
power source and separate ground are not provided, operation of
janitorial equipment can induce electrical noise and cause abnormal
operation of the computer system. Your electrician can verify whether
or not maintenance outlets are on separate panels.
Wall outlets
In geographical areas subject to lightning storms, it may by advisable
to install lightning protection for both personnel and computer systems.
The principles of lightning protection and personnel safety are
outlined in detail in the lightning protection code contained in the
National Fire Protection Association (NFPA) Handbook.
Lightning
The HP system is specifically designed to reduce its susceptibility to
radiated and conducted interference. Electromagnetic interference
can cause a variety of system problems. An HP representative can
advise you about the most common causes of electromagnetic
interference.
Electromagnetic interference
Site requirements for the HP XP12000 Disk Array46