Patch panels in the sky a case for free space optics in data centers
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Patch Panels in the Sky: A Case for Free-Space Optics in Data Centers. Navid Hamed Azimi , Himanshu Gupta Vyas Sekar, Samir Das. Datacenter network design is hard!. Performance. Cost. Energy. Cabling. Expandability. Cooling. Adaptability. Existing Choices. Cost. Core.

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Patch Panels in the Sky: A Case for Free-Space Optics in Data Centers

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Patch panels in the sky a case for free space optics in data centers

Patch Panels in the Sky:A Case for Free-Space Optics in Data Centers

Navid HamedAzimi,Himanshu Gupta

Vyas Sekar, Samir Das


Datacenter network design is hard

Datacenter network design is hard!

Performance

Cost

Energy

Cabling

Expandability

Cooling

Adaptability


Existing choices

Existing Choices

Cost

Core

Top of Rack (ToR)

Over subscribed

(tree, leaf spine,…)

Performance


Existing choices1

Existing Choices

Cost

Over provisioned

(Fattree, Jellyfish,…)

Core

Top of Rack (ToR)

Over subscribed

(tree, leaf spine,…)

Performance


Existing choices2

Existing Choices

Cost

Over provisioned

(Fattree, Jellyfish,…)

Core

Augmented

(c-Through , 3D Beam)

Top of Rack (ToR)

Over subscribed

(tree, leaf spine,…)

Performance


Existing choices3

Existing Choices

Cost

Over provisioned

(Fattree, Jellyfish,…)

Augmented

(c-Through , 3D Beam)

Can we get here?

Over subscribed

(tree, leaf spine,…)

Performance


Our vision

Our Vision

  • Core Coreless

  • Wired  Wireless

  • Static  Flexible


Potential benefits of this vision

Potential Benefits of This Vision

Performance

Cost

Coreless

Cabling

Wireless

Cooling

Flexible

Energy

Expandability

Adaptability


Patch panels in the sky a case for free space optics in data centers

Challenges in Realizing the Vision

  • Flexible wireless links

  • Network management


Patch panels in the sky a case for free space optics in data centers

Outline

  • Flexible wireless links

  • Network management

  • Feasibility & cost


Traditional rf is not sufficient

Traditional RF is not Sufficient

  • Wide beam

High interference


Traditional rf is not sufficient1

Traditional RF is not Sufficient

  • Wide beam

  • Difficult to narrow

High interference


Solution free space optical links fsos

Solution: Free Space Optical Links (FSOs)

  • No interference

  • High throughput

  • over long range

  • Easy to narrow beam


Patch panels in the sky a case for free space optics in data centers

Concerns with FSOs

  • Cost : $30K

  • Size : 3 ft³

  • Power: 60w

  • Flexibility


Why size cost power can be reduced

Why Size, Cost, Power Can be Reduced?

  • Traditional use : outdoor, long haul

    • High power

    • Weatherproof

  • Data centers: indoor, short haul

    • Low power

  • Feasible roadmap via commodity fiber optics

    • E.g. Small form transceivers (Optical SFP)


Proof of concept 1 gbps

Proof of Concept (1 Gbps)

Fiber connected

to SFP (TX)

SFP (RX)

Lens

Lens

Mirror

Mirror

SFP : 2x$40

Lens : 2x$30


Fso link throughput

FSO Link Throughput

PDF

  • Throughput

FSO link is the same as optical cable


Fso link misalignment tolerance

FSO Link Misalignment Tolerance

0.7 mm

3 mm

  • Effect of vibrations, etc.

    Movement tolerance

    • 0.7mm at destination

    • 3mm at source

  • TX

  • RX

FSO link is stable


Patch panels in the sky a case for free space optics in data centers

FSOs (1Gbps)

  • Cost : $30K

  • Size : 3 ft³

  • Power: 60w

  • Flexibility

  • Cost : $140

  • Size : 1x4 in

  • Power: 0.3w

  • Flexibility


Flexibility via switchable mirror

Flexibility via Switchable Mirror

  • Switchable Mirror: glass mirror

  • Electronic control, low latency

Ceiling Mirror

SM in “mirror”

mode

Receiver 1

Reciever2

Sender


Flexibility via switchable mirror1

Flexibility via Switchable Mirror

  • Switchable Mirror: glass mirror

  • Electronic control, low latency

Ceiling Mirror

SM in “mirror”

mode

Receiver 1

Reciever2

Sender

Receiver 1

Reciever2


Patch panels in the sky a case for free space optics in data centers

Outline

  • Flexible wireless links

  • Network management

  • Feasibility & cost


Management pre configuration

Management: Pre-Configuration

Input: FSO#, SM#,…

Output: Candidate links (Alignment of each SM)

Receiver 1

Reciever2

Sender

23


Management reconfiguration

Management: Reconfiguration

Input: Traffic

Output: Run-time topology

Receiver 1

Reciever2

Sender

24


Current solutions simple heuristics

Current Solutions: Simple Heuristics

  • Pre-Configuration : Regular Random Graph

  • Reconfiguration

    Only reconfigure for large flows

    Only delete a link if network remains connected


Patch panels in the sky a case for free space optics in data centers

Outline

  • Flexible laser link

  • Management

  • Feasibility & cost


Throughput

Throughput

  • 512 racks, 48 server/rack, hotspots traffic, flow level simulations

FSO based 2-4x improvement


Cost comparison

Cost Comparison

FSO based: Near 10G performance with 65% of cost


Conclusions

Conclusions

  • Data center network is challenging

  • Our vision: Fully flexible, coreless, wireless network

  • Key enablers : FSO + switchable mirrors

  • Early promise: ~ 10Gbps performance @ 65% cost

  • Future work: Improve FSO, better management


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