Standards + Site
20%of exam
Power Infrastructure
20%of exam
UPS TopologyGeneratorsATS/STSRedundancyGrounding
Cooling Infrastructure
20%of exam
ASHRAE TC 9.9CRAC/CRAHHot/Cold AisleFree CoolingLiquid Cooling
Facilities + Security
25%of exam
Operations + Efficiency
15%of exam
SOP/MOP/EOPCommissioningPUE/WUE/CUEMaintenanceBCDR
Quick Facts
- Exam
- CDCP
- Credential
- Data Centre Pro
- Time
- 60 min
- Pass
- 68% (27/40)
- Questions
- 40 MCQ
- Format
- Closed book
- Validity
- 3 years
- Blueprint
- 85/15
Tier Availability
I=671 | II=741 | III=982 | IV=995
I: no redundancyII: N+1III: concurrentIV: fault tolerant
Tier III vs IV
Tier III
- Concurrent maintain
- N+1 minimum
- Single fault survive
Tier IV
- Fault tolerant
- 2N active-active
- Multiple faults
Maintain vs tolerate
Tier Picker
- 99.67% ok→Tier I(No redundancy)
- Need N+1→Tier II(Power+cooling red)
- Concurrent maintain→Tier III(2N or N+1)
- Fault tolerant→Tier IV(2N active-active)
- 99.995% SLA→Tier IV(Highest)
- Cost constrained→Tier I(Basic)
Uptime Tiers
- Tier I
- N: 99.671%
- Tier II
- N+1: 99.741%
- Tier III
- Concurrent: 99.982%
- Tier IV
- Fault tolerant: 99.995%
- Concurrent
- Maintain without shutdown
- Fault Tolerant
- Survives single failure
Standards + Rated
- TIA-942
- US telecom standard
- EN 50600
- European DC standard
- ISO 22237
- Intl DC standard
- Rated-1
- Basic; no redundancy
- Rated-4
- Highest; 2N active
- Uptime Tier
- Operational; not TIA
Redundancy Ladder
N | N+1 | 2N | 2(N+1)
N: noneN+1: one extra2N: full duplicate2(N+1): dual+extra
AC vs DC Power
AC
- Standard delivery
- Transformable
- Generator native
DC
- No conversion loss
- Battery native
- HVDC emerging
Utility vs battery
UPS Topology Picker
- Basic office→Offline(No conditioning)
- Small server→Line-interactive(AVR boost)
- Data centre→Double-conversion(Zero transfer)
- Cost sensitive→Line-interactive(Mid tier)
- Mission critical→Double-conversion(Online VFI)
- Transfer <4ms→Double-conversion(No break)
Power Distribution
- UPS
- Uninterruptible supply
- PDU
- Power distribution unit
- ATS
- Auto transfer switch
- STS
- Static transfer switch
- Generator
- Backup power source
- SRG
- Signal ref grounding
- EPO
- Emergency power off
ATS vs STS
ATS
- Mechanical switch
- Utility-gen transfer
- Seconds
STS
- Static electronic
- Sub-cycle transfer
- Millisecond
Mechanical vs static
Redundancy Schemes
- N
- No redundancy
- N+1
- One extra unit
- 2N
- Full duplicate
- 2(N+1)
- Dual system + extra
- Concurrent
- Maintain one path
- Catch
- N+1 common bus risk
CRAC vs CRAH
CRAC
- Direct expansion
- Refrigerant coil
- Compressor
CRAH
- Chilled water
- Water coil
- No compressor
DX vs water
Cooling Method Picker
- Low density→CRAC/CRAH(Perimeter)
- High density→In-row(Close to rack)
- Rear door→RDHx(Passive)
- Mild climate→Air-side(Free cooling)
- Extreme density→Immersion(Liquid)
- Chip direct→Direct-to-chip(Cold plate)
Cooling Systems
- CRAC
- Direct-expansion AC
- CRAH
- Chilled water coil
- In-row
- Rack-adjacent cooling
- RDHx
- Rear door heat exch
- Hot Aisle
- Exhaust containment
- Cold Aisle
- Intake containment
- Economizer
- Free cooling source
Cooling Methods
- Air-side
- Outside air economizer
- Water-side
- Cooling tower economizer
- Adiabatic
- Evaporative cooling
- Immersion
- Fluid submersion
- Direct-to-chip
- Cold plate liquid
- ASHRAE A1
- 18-27 °C envelope
Fire Classes
A=solid | B=liquid | C=electrical | D=metal
A: paper/woodC: live electricalD: combustible metal
Raised Floor vs Slab
Raised Floor
- Air + cable
- Access below
- Load limit
Slab
- Overhead tray
- No floor plenum
- Higher load
Under vs over
Fire Protection
- NFPA 75
- IT equipment standard
- VESDA
- Early smoke detect
- FM-200
- HFC-227ea clean agent
- Novec 1230
- FK-5-1-12 agent
- IG-541
- Inergen; inert gas
- Water Mist
- Fine droplet suppress
- Pre-action
- Double-interlock sprinkler
FM-200 vs Novec 1230
FM-200
- HFC-227ea
- GWP high
- Phase-out pressure
Novec 1230
- FK-5-1-12
- GWP low
- Sustainable
HFC vs FK
Physical Security
- Mantrap
- Two-door interlock
- Biometric
- Fingerprint/iris scan
- CCTV
- Surveillance cameras
- IDS
- Intrusion detection sys
- Perimeter
- Outer fence layer
- Access Card
- Badge entry control
- Layered
- Perimeter to rack
Structured Cabling
- MDA
- Main dist area
- HDA
- Horizontal dist area
- EDA
- Equipment dist area
- ZDA
- Zone dist area
- OM3/OM4
- Laser-optimised fibre
- OM5
- Wideband multimode
- Cat 6A
- 10GBase-T copper
Building + Auxiliary
- Raised Floor
- Air + cable distribution
- Slab
- Overhead cable tray
- Load
- Floor kN/m² rating
- BMS
- Building mgmt sys
- EPMS
- Env power monitoring
- DCIM
- DC infra management
- EMF
- Magnetic field shielding
DC Lifecycle
Design | Build | Operate | Decommission
Design: planBuild: constructOperate: runDecommission: retire
SOP vs MOP
SOP
- Standard procedure
- What to do
- Routine task
MOP
- Method of procedure
- How to do
- Step-by-step
What vs how
Operations Procedures
- SOP
- Standard op procedure
- MOP
- Method of procedure
- EOP
- Emergency op procedure
- AOR
- Auth ops report
- SLA
- Service level agmt
- OLA
- Operational level agmt
- Cx Level
- Commissioning 1-5
Efficiency Metrics
PUE=Total/IT | WUE=Water/IT | CUE=Carbon/IT
PUE: lower betterDCiE=1/PUEISO 30134
Efficiency + BCDR
- PUE
- Total/IT power
- WUE
- Water/IT energy
- CUE
- Carbon/IT energy
- DCiE
- 1/PUE efficiency
- RTO
- Recovery time objective
- RPO
- Recovery point objective
- ISO 30134
- Resource efficiency KPIs
Common Traps
Tier vs Rated
Uptime = operational ≠ TIA-942 = facility
ATS vs STS
ATS mechanical ≠ STS static sub-cycle
CRAC vs CRAH
CRAC = DX compressor ≠ CRAH = chilled water
N+1 vs 2N
N+1 = one extra ≠ 2N = full duplicate
PUE direction
Lower is better ≠ 1.0 = ideal
Raised floor load
Check kN/m² ≠ Not just tile size
Last Minute
- 1.Tiers: I/II/III/IV avail
- 2.N+1 vs 2N redundancy
- 3.Double-conversion = online UPS
- 4.ASHRAE: 18-27 °C
- 5.PUE = Total/IT (lower)
- 6.VESDA + clean agent
- 7.MDA/HDA/EDA cabling
- 8.SOP/MOP/EOP procedure
- 9.Cx levels 1-5; IST pull-plug
- 10.3-year validity; recertify
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