Data Center Fundamentals: The Datacenter as a Computer
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1 Data Center Fundamentals: The Datacenter as a Computer George Porter CSE 124 Feb 10, 2017 Includes material from (1) Barroso, Clidaras, and Hölzle, as well as (2) Evrard (Michigan), used with permission and/or via a Creative Commons License
2 Announcements Readings: Barroso book (chs 1-5) Brewer paper (linked off course schedule) Today: Datacenter basics
3 SDSC Data center tour Interest list will be posted soon Please sign up if interested
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8 Host Virtualization Multiple virtual machines on one physical machine Applications run unmodified as on real machine VM can migrate from one computer to another 8
9 VMM Virtual Switches 9
10 The storage hierarchy
11 Latency, bandwidth, and capacity
12 Performance of flash
13 Hardware comparisons Barroso and Holzle, The Data Center as a Computer: An introduction to the Design of Warehouse-Scale Machines
14 Big computer vs. lots-of-small-computers Barroso and Holzle, The Data Center as a Computer: An introduction to the Design of Warehouse-Scale Machines
15 Big computer vs. lots-of-small-computers Barroso and Holzle, The Data Center as a Computer: An introduction to the Design of Warehouse-Scale Machines
16 400V Automatic Transfer Switch Xiaobo Fan, Wolf-Dietrich Weber, and Luiz Andre Barroso Power provisioning for a warehouse-sized computer. In ISCA '07.
17 Heat management CRAC unit rack rack rack rack CRAC unit floor tiles Liquid supply Regents of the University of Michigan
18 Quantifying energy-efficiency: PUE PUE = Power Usage Effectiveness Simply compares Power used for computing Total power used Historically cooling was a huge source of power E.g., 1 watt of computing meant 1 Watt of cooling! PUE = (Facility Power) / (Computing Equipment power)
19 LBNL PUE Survey (2007) Barroso and Holzle, The Data Center as a Computer: An introduction to the Design of Warehouse-Scale Machines
20 LBNL PUE Survey (2013)
21 Breakdown of data center overheads Barroso and Holzle, The Data Center as a Computer: An introduction to the Design of Warehouse-Scale Machines
22 Numbers from James Hamilton (MSFT, Amazon)
23 Limits of lowering PUE? Google s Chiller-less data center in Belgium Most of the year it is cool enough to not need cooling What about on hot days? Shed load to other data centers!
24 Power-proportional Computing
25 Power-proportional humans Barroso and Holzle, The Data Center as a Computer: An introduction to the Design of Warehouse-Scale Machines
26 Web-service load fluctuations Barroso and Holzle, The Data Center as a Computer: An introduction to the Design of Warehouse-Scale Machines
27 Do different components scale similarly? Barroso and Holzle, The Data Center as a Computer: An introduction to the Design of Warehouse-Scale Machines
28 Improving efficiency * datacenter-level (PUE) use passive cooling (NCSA Blue Waters, UC Berkeley CRTF) avoid UPS devices (lower Tier level) avoid AC/DC conversion use green power (Icelandic model) * rack-level (SPUE) avoid local power supplies more efficient voltage regulation * processor/process-level speed-variable processors embedded, low-power processors (memristors?) smarter parallelization / distribution of work
29 CPU utilization Barroso and Holzle, The Data Center as a Computer: An introduction to the Design of Warehouse-Scale Machines
30 What about power saving features on modern computers?
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32 Power supply efficiency and SPUE
33 Oversubscribing data center power?
34 Decreasing role of voltage scaling
35 The connection between data center networks and energy
36 Traditional DC Topology Core Internet Layer-3 router Data Center Aggregation Layer-2/3 switch Access Layer-2 switch Servers 36
37 Layer 2 Pods w/l3 Backbone Internet DC-Layer 3 DC-Layer 2 CR CR AR AR... AR AR S S S S S S S S S S S S... ~ 1,000 servers/pod == IP subnet Key CR = Core Router (L3) AR = Access Router (L3) S = Ethernet Switch (L2) A = Rack of app. servers 37
38 Capacity Bottlenecks CR CR ~ 200:1 AR AR AR AR S S S S S ~ 40:1 ~ 5:1 S S S... S S S S Discussion: Implications for energy efficiency? Recall: 38
39 Tree-based network topologies Can t buy sufficiently fast core switches! 100,000 x 10 Gb/s = 1 Pb/s 39
40 Folded-Clos multi-rooted Trees With k-port switches, can support k 3 /4 hosts Al Fares, et al., Sigcomm Gb/s Switches Core Aggregation Edge Gb/s servers Pod Pod 1 Pod 2 Pod 3 40
41 Multi-rooted Trees Benefits: No more bandwidth bottlenecks All switches can be same speed Don t need expensive/fast switches at root Downsides: Bandwidth achieved only if traffic evenly spread across all the possible paths Network itself uses quite a bit of power But how much?
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