Raritan Solution

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Rack PDU - Solution Brief

Case Studies : Challenges

Solved in Peer Facilities

Jon Inaba

Director, Power Management Solutions

Raritan

A Strong Reputation for Innovation…

Recent, major data center builds have selected

Raritan for best-of-breed Rack PDUs.

etc…

…by Consistently Solving Practical Client

Problems

The rack PDU occupies a critical and strategic position in the power chain: a “best-of-breed” strategy provides opportunities to significantly improve data center operations in practical and economical ways.

• Increase Rack Density (Servers / Cabinet)

• Safely deploy 400v/3ph distribution to the cabinet;

• Sought industry expertise on practical matters @ 400V/3ph;

• Reduce # whips required per cabinet for high density;

• Six L6-30R [208V / 1ph] from one 208V / 3ph whip;

• Required breadth of 17.3kVA configurations

[208V / 3ph / 60A input on IEC 460R]

…by Consistently Solving Practical Client

Problems

The rack PDU occupies a critical and strategic position in the power chain: a “best-of-breed” strategy provides opportunities to significantly improve data center operations in practical and economical ways.

• Reduce high-density (17kVA+) costs with

UL Listed power strips utilizing conduit input;

• Develop solution for 50kW cabinet;

• Increase quality / reduce MTBF in rack PDUs;

• Enforce best-practices for load-balancing: o

blade chassis + other high-power devices; o

on high-power PDUs (208V / 3ph / 60a);

Twitter: Increase Rack Capacity with Confidence

Challenge

• Client standard = ~35 servers / rack. Power believed stranded / under-utilized;

• Required rack power strip that:

• provided enough outlets to accommodate more servers (42+)

• ensured no power faults due to overloading [monitoring accuracy];

• fits in same exact form factor as incumbent;

Raritan Solution

NEMA L21-30P

208v / 3ph / 30A

8.6kVA

48xC13 and 3x NEMA 5-20R in 2.1” wide chassis

Twitter: Increase Rack Capacity with Confidence

+/- 1% Metering per Breaker Assures Fault Prevention & Detection…

… at same price as competitor’s 36-outlet model

Disney: Deploy 400v/3ph Power to Rack Safely

Challenge

• New datacenter in Kings Mountain, NC;

• Client wished to harness cost savings / electrical of 400v/3ph to the rack;

• Still relatively new in North American market;

Raritan Solution

• Leading pioneer of 400v/3ph rack

PDUs

in North America;

• Largest install base of relatively “exotic”

emerging standard [“European”];

• At client’s request, fabricated chassis to

match UPS color scheme [blue, green,

magenta, and yellow];

400V / 3ph to the Cabinet? Makes sense >12.6kVA

Reduced transmission loss

(Ohm’s Law V=IR)

Reduced step-down transformation loss

Less copper, more power

Already in widespread deployment worldwide

AC Power Cable Cross-Section @ ~17.5kW

17.3kW

@208V

18kW

@400V

3P 4W, 4# (48A)

32mm (1.26

) OD

4P 5W, 8# (24A)

27.3mm (1.08

) OD

Source: General Cable SOOW Spec Sheet

…Delivering More Power at Same Ampacity

208v / 1ph / 30a 208v / 3ph / 30a 400v / 3ph / 30a

Phase

Input Voltage

Output Voltage

Single phase

208V

208V

Three phase Delta

208V, 3-phase

208V

Three phase Wye

400V, 3-phase

230V

5.0 kVA 8.6 kVA 16.6 kVA

Apparent power

1U servers supported*

2u servers supported*

Blade chassis supported*

24

24

1

41

41

1-2

80

80

3-4

*HP Proliant DL360G6 1U server, 206 watts at 80% load on SPECpower_ssj2008

HP Proliant DL380G6 2U server, 208 watts at 80% load on SPECpower_ssj2008

HP Proliant C7000, ProLiant BL2x220c G6, 4860 watts at 80% load on SPECpower_ssj2008

…but 400v/3ph Power Requires Unique Expertise

Until very recently, 400v/3ph power distribution considered “European”.

True, practical expertise at this standard is rare in North America

Arc Flash Hazard.

Unlike status quo, 400v/3ph technically poses an arc flash hazard.

Special care required in design and specification of power strip;

Product Selection.

Other vendors lack the install base, and therefore the breadth of product selection, in the 400v/3ph electrical specification.

Input Plug Preference.

Relatively new to North America, confusion abounds regarding the correct input plug to utilize:

• NEMA L22? or NEMA L7?

• IEC 60309 (“Pin-and-Sleeve”)? If so…

Ground pin at 6HR (415v max) : red plug?

typically considered a European plug, can it pass UL?

Ground pin at 7HR (480v max) : blue plug?

typically considered a North American plug, but 480v?

Harmonics.

Line-to-Neutral wiring can induce harmonics / current on the neutral line, if load is not properly balanced.

Cisco: Reduce #Whips for High-Density Cabinet

Challenge

• Common problem for certain blade servers, and many Cisco devices

[e.g. Nexus 7000 series]

• Power supplies hardwired with L6-30P power supplies;

• Customers assume rack PDUs cannot be used, run 6x whips;

Raritan Solution

• Design rack PDU with 30A breakers and NEMA L6-30R outputs;

Cisco Example: Exadata Cabinets

BEFORE

12 x Single phase

30A

Circuits

Floor

PDU / RPP

Floor

PDU / RPP

Cisco Example: Exadata Cabinets

AFTER

2x Three-Phase, 50A circuits

Floor

PDU / RPP

Floor

PDU / RPP

Cisco: Electrical Equivalence with Fewer Whips

In concept, a remote “Branch Panel”… metered + monitored for fault prevention

Intuit: Maximize Deployment Flexibility @60A/3ph

Challenge

• Very small selection of rack PDU options above 12.6kVA from most vendors;

• Need a 3ph / 60a solution flexible to accommodate blades OR 1U/2U/storage;

• Most vendors assume blades; or 1U/2U/storage – not flexible;

Raritan Solution

• 17.3kVA (208v / 3ph / 60a)

• 12x C19’s allow deployment of up to 4x blade servers;

• 24x C13’s allow deployment of ~20x 2U servers + switches;

• Six circuit breakers protect load against bad power supplies;

• Cable exits on end of PDU to simplify cable management of very large SO cord;

• Each “bank” of outlets alternates phases to enable easier blade server deployment (

see LinkedIn case study, later in this slide deck

)

Intuit: Maximize Deployment Flexibility @60A/3ph

Expert Consultation: 60A / 3ph Plug Selection

• 208v / 60A / 3ph power strip requires 4-conductor / #4 AWG input cable;

• SOOW UL rated cable is 1.26” in diameter, and weighs 11.5 pounds*!!

• Appropriate plug selection required to ensure reliable connection;

SOME VENDORS

(cheaper)

IEC 60309 3-Pole 4-Wire

**

“Pin-and-Sleeve / CEEform”

IP44 (“Splashproof”)

“460C9 or 460R9”

RARITAN STANDARD

(secure locking ring)

IEC 60309 3-Pole 4-Wire

“Pin-and-Sleeve / CEEform”

IP67 (“Watertight”)

“460C9W or 460R9W

CLIENT’S CUSTOM CHOICE

(physically smallest)

NEMA 15-60P

IP44 (“Splashproof”)

* assumes 10ft input cable

** photo shows 2P3W

eBay: Reduce High-Density Cost w/ Conduit

Challenge

• Client regularly deploys cabinets exceeding 20kW;

• Above 16.2kVA (208v / 3ph / 45a), SOOW cord and plug becomes very expensive;

Raritan Solution

• Design rack PDU option for “hard-wiring” to user-accessible terminal block;

• Worked with certification authorities to attain UL Listing;

• Worked with StarLine (Universal Electric) to provide appropriate tap box;

• Deployed SealTite flexible conduit at 1”

Trade Size;

eBay: Reduce High-Density Cost w/ Conduit

SealTite flexible conduit

@ 1” Trade Size

Standard conduit fittings mate to punchout on PDU

Savings (at ~17kVA)

Part

PDU Cord

Spec

10’ SOOW

#4 AWG

IEC 60309 PDU Plug

Tap Box

Connector

Tap Box Cord

Tap Box

Strain Relief

IEC 60309

2’ SOOW

#4 AWG

Kellems Mesh

Grip, 1.5” O.D.

~$1000 per rack

Price

$88

$173

$205

$17

$48

Electrician- accessible terminal block

New design far cheaper

:

• ~1hr of electrician time (max);

• “Bare” wire conductors;

• Inexpensive condaauit;

• “Permanent” installation;

Comcast: Improve Reliability of Rack PDUs

Challenge

• Previous rack PDU vendor = boutique North American company; inconsistent manufacturing quality

• Largest rack PDU vendor only employs production sample tests;

• Rack PDU quality failures highly disruptive, and costly to change;

Raritan Solution

• ISO 9001 manufacturing: flexibility of small company, reliability of multinational;

• Load-testing on 100% of production units;

• Quality from design through manufacturing;

Quality

Manufacturing

Processes

Quality

Components

Quality

Design

Comcast: Improve Reliability of Rack PDUs

Quality Components = A Raritan Core Competence e.g. CPU.

Raritan supplies the exact same CPU as found on our power strips, to the world’s most-demanding, Tier 1, server manufacturers.

Our CPU must pass the most stringent heat, manufacturing, quality, and stress tests / audits.

e.g. Power Chain Components (Inlet Power Cord. Terminal Block. etc.)

Raritan rack

PDUs are UL Listed at a higher ambient temperature than all competitors, due to the use of better components throughout the entire power chain.

LinkedIn: Eliminate Stranded Capacity by Design

Challenge

• Due to weight and exhaust heat, users typically place high-power equipment (e.g. blade servers) toward the bottom of the rack;

• Client deploys 3-phase power;

• Results in overutilization of one electrical phase [outlets closest to bottom of rack]; and underutilization of other two phases = Stranded capacity.

Raritan Solution

Phase 3

(L3/L1)

Phase 2

(L2/L3)

Phase 1

(L1/L2)

Every Outlet

Every Breaker

Clearly labeled

Phase 3

(L3/L1)

Phase 2

(L2/L3)

Phase 1

(L1/L2)

Expertise to Improve Major Projects

When design / planning data center projects,

Raritan’s unique expertise, install base, industry innovation can dramatically improve data center operations.

High Power Experience and Product Portfolio.

• Largest selection of Rack PDUs above 12.6kVA;

• Largest selection and install base of N. American

Rack PDUs at 400v/3ph;

“Perfect Fit” Custom Options w/o Price Premium.

• Small differences make very large operational impact;

• e.g. Cord length; Outlet options; Mechanical options;

Quality: 100% Testing; ISO 9001 Manufacturing;

Highest Ambient Temps

Rack Power Monitoring at Large Scale.

Our IT capabilities + industry’s largest

deployed

customer installations provide unique expertise implementing functional an valuable rack power monitoring.

Thank You!

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