Cold Air Containment · Mikko Pervilä & Jussi Kangasharju 18.8.2011 2 Reseach goals 1)Reduce...
Transcript of Cold Air Containment · Mikko Pervilä & Jussi Kangasharju 18.8.2011 2 Reseach goals 1)Reduce...
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www.helsinki.fi/yliopisto
Cold Air ContainmentGreen Networking Workshop at SIGCOMM 2011
Friday, August 19th, 2011
Mikko Pervilä and Jussi Kangasharju
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Mikko Pervilä & Jussi Kangasharju 218.8.2011www.helsinki.fi/yliopisto
Reseach goals
1) Reduce cooling requirements (this talk)
1) A/C performance
2) Chilling plant performance
2) Produce cooling for free (GreenNet 2010)
3) Harvest exhaust heat (future work)
...With minimal rebuilding = cheaply
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Mikko Pervilä & Jussi Kangasharju 318.8.2011www.helsinki.fi/yliopisto
source: Urs Hoelzle, European DC Summit 2011* source: GeSI/The Climate Group: SMART 2020** source: NRDC
72%
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Mikko Pervilä & Jussi Kangasharju 418.8.2011www.helsinki.fi/yliopistosource: Joe Kava, European DC Summit 2011
Materials: Steel and plastics
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Mikko Pervilä & Jussi Kangasharju 518.8.2011www.helsinki.fi/yliopisto
Cold Air Containment
● VanGilder's patent filed in 2005:
● Cold Aisle Isolation
● HP's white paper:
● Hilss and Iyer, Improved data center efficiency — incorporating air stream containment, 2009 (URL)
● Emulation-based, details omitted
● 14% to 41% “efficiency improvements”
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Mikko Pervilä & Jussi Kangasharju 618.8.2011www.helsinki.fi/yliopisto
Mixed air flows
Ra
ck
Ra
ck
CR
AC
Side view
Raised floor
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Mikko Pervilä & Jussi Kangasharju 718.8.2011www.helsinki.fi/yliopisto
Separate air flows
Side view
Ra
ck
Ra
ck
CR
AC
Plastic wrap
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Mikko Pervilä & Jussi Kangasharju 818.8.2011www.helsinki.fi/yliopisto
Case: CERN
● “Flagship” installation
● Video from visitor area of CERN's DC
● http://www.youtube.com/watch?v=x5rmtSpuSGA
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Mikko Pervilä & Jussi Kangasharju 918.8.2011www.helsinki.fi/yliopisto
Just buy it?
● Too much rebuilding
● New racks, reinstall everything
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Mikko Pervilä & Jussi Kangasharju 1018.8.2011www.helsinki.fi/yliopisto
Just build a CFD?
● Computational Fluid Dynamics model
● Complex = expensive
● Google's modelling several (4+) iterations
● Cost: 5-10 k$
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Mikko Pervilä & Jussi Kangasharju 1118.8.2011www.helsinki.fi/yliopisto
Real implementation
● Our costs 120.65 € in total:
● Plastic covers 29.50 €
● PVC tubes 37.14 €
● Duct tape 54.01 €
● Built in 3 hrs bythree persons
● Some cornerswere cut
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Mikko Pervilä & Jussi Kangasharju 1218.8.2011www.helsinki.fi/yliopisto
Before changes
Typical DC evolution→
Inefficient placement?
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Mikko Pervilä & Jussi Kangasharju 1318.8.2011www.helsinki.fi/yliopisto
Computer Room A/C (CRAC)
Engineering solution: add more power
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Mikko Pervilä & Jussi Kangasharju 1418.8.2011www.helsinki.fi/yliopisto
Chilling plant
And more chilling plants.
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Mikko Pervilä & Jussi Kangasharju 1518.8.2011www.helsinki.fi/yliopisto
Two chilling plants
Sharedchilling plant
Dedicatedchilling plant
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Mikko Pervilä & Jussi Kangasharju 1618.8.2011www.helsinki.fi/yliopisto
Data CenterBK117
Ukk
o
CR
AC
CR
AC
CR
AC
CR
AC
CR
AC
sto
rag
e
HIIT
CS
De
pt.
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Mikko Pervilä & Jussi Kangasharju 1718.8.2011www.helsinki.fi/yliopisto
Power draws
● 75 kW max power draw of Ukko cluster
● 55 kW cooling equipment installed in 2010
● 6,9 kW of Computer Room A/C (CRAC) units
● 44,7 kW chilling plant
● 3,8 kW rooftop radiator
● IT + CRAC load
● 85 kW typical
● 115 kW sustained peaks
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Mikko Pervilä & Jussi Kangasharju 1818.8.2011www.helsinki.fi/yliopisto
Week before 26.3.2011
Ukko cluster
Total
Storage, HIIT, CRAC, UPS
CS Dept.
1 hour
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Mikko Pervilä & Jussi Kangasharju 1918.8.2011www.helsinki.fi/yliopisto
Rising ambient temperature
Inlet temperatures from one hostAbsolute values suspect, relative change correct
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Mikko Pervilä & Jussi Kangasharju 2018.8.2011www.helsinki.fi/yliopisto
Finished installation
ᄃ
after_CAC_installation.mp4http://www.youtube.com/watch?v=jZIuJIVYsDs
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Mikko Pervilä & Jussi Kangasharju 2118.8.2011www.helsinki.fi/yliopisto
Effects on Ukko● Two 16 h periods before and after
● Before: 7 hrs normal, 9 hrs peak load
● After: 9 hrs peak, 7 hrs normal load
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Mikko Pervilä & Jussi Kangasharju 2218.8.2011www.helsinki.fi/yliopisto
Less cooling needed● Same time periods as before
● Two CRAC:s kept on same set point
● Two CRAC:s adjusted up by 7 C
● One CRAC shut off completely!
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Mikko Pervilä & Jussi Kangasharju 2318.8.2011www.helsinki.fi/yliopisto
But power...
2 kW drop
Real savings at the chilling plant(s)?
Ukko cluster
Total
Storage, HIIT, CRAC, UPS
CS Dept.
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Mikko Pervilä & Jussi Kangasharju 2418.8.2011www.helsinki.fi/yliopisto
Cooling fluid measurements
Set pointunchanged
Set pointraised by 7 °C
Cooling fluidmeasured here.Valves (W, S)
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Mikko Pervilä & Jussi Kangasharju 2518.8.2011www.helsinki.fi/yliopisto
Before change, valve W
Periodic dropsof temperature
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Mikko Pervilä & Jussi Kangasharju 2618.8.2011www.helsinki.fi/yliopisto
After change, valve W
Almost stabletemperature
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Mikko Pervilä & Jussi Kangasharju 2718.8.2011www.helsinki.fi/yliopisto
Before change, valve S
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Mikko Pervilä & Jussi Kangasharju 2818.8.2011www.helsinki.fi/yliopisto
After change, valve S
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Mikko Pervilä & Jussi Kangasharju 2918.8.2011www.helsinki.fi/yliopisto
Pressure differences
● Inefficient placementstrikes back
● Less aisles is better
● sock_video.mp4● YouTube link
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Mikko Pervilä & Jussi Kangasharju 3018.8.2011www.helsinki.fi/yliopisto
“Finalized” version
● Switch to hard plastic sheets (video)
● http://www.youtube.com/watch?v=8-uybY91f4o
● Extra cost: ~260 €
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Mikko Pervilä & Jussi Kangasharju 3118.8.2011www.helsinki.fi/yliopisto
Reseach goals
1) Reduce cooling requirements (this talk)
2) Produce cooling for free (GreenNet 2010)
3) Harvest exhaust heat (?)
...With minimal rebuilding = cheaply
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Mikko Pervilä & Jussi Kangasharju 3218.8.2011www.helsinki.fi/yliopisto
Last year at GreenNet
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Mikko Pervilä & Jussi Kangasharju 3318.8.2011www.helsinki.fi/yliopisto
Helsinki Chamber (HC)
- rack servers- much more heat- improved air flow- more reflective
+ CAC prototype!
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Mikko Pervilä & Jussi Kangasharju 3418.8.2011www.helsinki.fi/yliopisto
…And then we built that
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Mikko Pervilä & Jussi Kangasharju 3518.8.2011www.helsinki.fi/yliopisto
Summary
● Cold Air Containment optimizes cooling
● Can now install 20% more load
● A/C can take it
● Chilling plants can take it(?)
● Tent and HC demonstrate free cooling
● Next project: Harvesting exhaust heat
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Mikko Pervilä & Jussi Kangasharju 3618.8.2011www.helsinki.fi/yliopisto
Questions?
Pictures by● Janne Ahvo
● TuomasPuikkonen
● SebastianSiikavirta
Thanks!
Clear plastics are safe!