Page 270 - CISSO_Prep_ Guide
P. 270
system opens the water valve to
release water into the pipes (relies on
the secondary system).
• Water threats – don't have pipes above
server room; don't put datacenter in
basement.
• Power threats:
• Have emergency power off (EPO).
• Blackout – prolonged loss of
commercial power.
• Fault – a momentary loss of power.
• Brownout – reduction of voltage by
the utility company for a prolonged
period.
• Sag/Dip – short period of low voltage.
• Surge – sudden rise (not as sharp as
a spike).
• Transients – line noise that causes
fluctuation in power.
• Inrush current – an initial surge of
current when there is an increase in
power demand.
• Electrostatic discharge – static
electricity.
• Noise – EMI & Radio Frequency
Interference (RFI).
• Countermeasures – backup
generators and UPS (most have both
because generator takes a while to
activate).
• Heating/Cooling:
