HP XP20000/XP24000 HP StorageWorks XP24000/XP20000 Disk Array Site Preparation - Page 42

Protection against sources of electrical interference, Uninterruptible Power Supply (UPS), Description

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If necessary, an HP representative can measure your power line noise level and make appropriate recommendations concerning the use of line treatment devices. Protection against sources of electrical interference Table 15 describes ways to protect the disk array from electrical interference. Table 15 Sources of electrical interference Potential source Description Wall outlets 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 maintenance outlets are on separate panels. Lightning 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. Electromagnetic interference The disk array 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. Uninterruptible Power Supply (UPS) Most disk array units are installed in data centers where an uninterruptible power supply (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 HP disk array. Make sure your UPS satisfies the power requirements. 42 Site requirements for the HP Disk Arrays

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If necessary, an HP representative can measure your power line noise level and make appropriate
recommendations concerning the use of line treatment devices.
Protection against sources of electrical interference
Table 15
describes ways to protect the disk array from electrical interference.
Table 15 Sources of electrical interference
Description
Potential 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 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 pro-
tection code contained in the National Fire Protection Association (NFPA) Handbook.
Lightning
The disk array 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 inter-
ference
Uninterruptible Power Supply (UPS)
Most disk array units are installed in data centers where an uninterruptible power supply (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 HP disk array.
Make sure your UPS satisfies the power requirements.
Site requirements for the HP Disk Arrays
42