Download SK0-004-04

CompTIA Server+ Certification
(Exam SK0-004)
4.3 Power Distribution
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Objectives
• Implement server-class
power supplies and UPS
• Describe features of data
center power distribution
4.3 Power Distribution
319
Power
• Voltage
o
Potential difference
o
Volts
• Current
o
Flow of electrons
o
Amps
• Resistance
o
(Non) conductivity
o
Ohms (R)
• Power
o
Watts
o
Volts * Amps
• AC versus DC
• VAC supply differences
4.3 Power Distribution
319
Power Problems
• Fuse
• Grounding
• Surges
• Sags
• Brownouts
• Blackouts
• Electromagnetic
Interference
4.3 Power Distribution
320
Power Supply Unit
• Wattage and Power
Rating
• Rack-mounted and
Blade PSUs
• Redundant Power (Hot
Plug PSUs)
• Standalone PSUs
4.3 Power Distribution
322
Connector Types and Voltages
• ATX Power Supply
• P1 (motherboard)
•
24-pin (legacy 20-pin)
• Molex / SATA
•
Device power
• PCIe
•
Supplement bus power
•
8-pin (legacy 6-pin)
• P4 / EPS12V
4.3 Power Distribution
•
CPU power
•
8-pin (4-pin legacy)
324
Dealing with Power Problems
• Surge suppressor
• Line conditioner
• Uninterruptible Power Supply (UPS)
• Backup generator
4.3 Power Distribution
325
Uninterruptible Power Supplies (UPS)
• Types
o
Online
o
Line interactive
o
Offline
• Ride-through
• Configuration tools
4.3 Power Distribution
325
UPS Sizing
• Maximum load
o
VA versus watts
o
Apparent power versus actual
power
o
Power Factor / Power Factor
Correction (PFC)
• Run time versus capacity
4.3 Power Distribution
327
UPS in the Data Center
• Data center capacity
planning
• UPS monitoring
o
Status alerts
o
Power event behavior
4.3 Power Distribution
330
UPS Maintenance
• Size and weight – handling and placement
• Battery replacement
o
Test procedures
o
Hot swapping batteries (bypass mode)
o
Battery disposal
4.3 Power Distribution
331
PDUs
• Circuit current (amperage)
• Power Distribution Unit (PDU)
o
Maximum load (V*A = W)
o
Allow 20% overhead
o
Connector types (IEC Cxx and NEMA x-yy)
4.3 Power Distribution
333
Power Circuits
• Power conversions
o
o
o
440V, 460V, or 480V delivered to the UPS, which will either output
the same voltage to the PDU or use a 3-phase scheme to output
480 / 277 VAC or 415 / 240 VAC to the PDU
The PDU converts the high voltage AC mains supply to a "regular"
AC voltage (usually one of 208 VAC, 277 VAC, or 240 VAC) for the
PSUs
The PSUs then perform their power conversion to deliver 12V DC to
the server components or blade enclosure
• 48V DC supply
• Redundant power circuits
• 3-phase power supply
• Twist-lock plug types (NEMA Lx)
4.3 Power Distribution
334
Review
• Implement server-class
power supplies and UPS
• Describe features of data
center power distribution
4.3 Power Distribution
336