Open Connect: Starting from a Greenfield (a mostly Layer 0 talk) Dave Temkin 06/01/2015
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1 Open Connect: Starting from a Greenfield (a mostly Layer 0 talk) Dave Temkin 06/01/2015
2 The story It all started with a discussion... After much debate, the Netflix CDN team was launched in mid-2011 We built caches. They were red. Now they serve lots of Terabits and we call our CDN Open Connect
3 A decision had to be made... Do we use caches inside of ISP networks that want them.. And then continue to use third party CDNs Or build a fully functional, standalone CDN
4
5
6 A single purpose system Deliver video at the highest quality possible while allowing operators the ability to manage the traffic on their network
7
8 2012
9 Now and... Storage Appliance Still 4U high ~550 watts 288 TB of storage 2x 10G ports 20Gbit/s delivery Flash Appliance 1U ~175 watts 24 TB of flash 2x 40G ports 40Gbit/s delivery
10 Cache Types We have two main types of Netflix Caches Rev H: 36 8TB spinning drives, up to 20Gbit Used for catalog offload Rev I: 24 1TB SSD s, up to 40Gbit Used for high speed popular content serving Our mantra has been to use the same hardware that we would expect an ISP to install in their network Consistent software stack
11 Left: Storage OCA Right: Offload OCA
12 Power Utilization and Footprint Rev H: 560 watts.31 watts per megabit Rev I: 250 watts.006 watts per megabit Our standard deployment has been 10 Rev H s per rack and 30 Rev I s, or a 5.6kW/7.5kW deployment
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16 Today s focus Layer Zero: Peering and Interconnection Locations
17 A big challenge Goal was to be off third party CDNs by 2013 At a reasonable cost compared to what we were paying CDNs (Remember, Vertical Integration) At better quality Scalable for global growth
18 Our first attempt ~24G of capacity
19 To ~4Tbits of edge capacity in 4 racks...
20 2.4T of serving capacity at a small peering location 35kW of power
21 A note on site selection Pick the most popular site in a metro Can t find space and power? Maybe the second most popular
22 Challenges 5.6kW for Rev H s is relatively easy to get Fully loaded, we ask for a 6.5kW per rack footprint 7.5kW is stretching the limits of most legacy data centers Rev H s are space limited (most sites can accommodate a 42U rack, so we engineer to that) Rev I s are power limited Would like to go from 250 watts to 300 watts End up with a 9kW rack Easy when you own the data center, not so easy when you lease
23 Cabling Something taken for granted for many years Call up a contractor, have them run some fiber, plug it all in Not so simple anymore 10G in the data center is still the most affordable 40G mostly there 100G still prohibitive beyond interconnect
24 This doesn t happen by accident but takes an hour to do.
25 1 of 18 custom cable types...
26 This next slide was originally going to have a witty GIS ed image for Cable Porn But I had turned SafeSearch off and quickly abandoned that idea
27
28 Moving on... Somehow we need to get the data out of here..
29 Right: 1440 cross connects per rack 288x10G or 100G = 2.88 or 28.8 Terabits Left: 192 cross connects per rack
30 Rapid Deployment Having custom cables to fit our deployment allows for rapid implementation Only levers are lengths and types Allows for a complete solution to be shipped to site If everything goes well, we can have a multi-terabit site online in less than two days Never underestimate the value of not having $colo vendors touch anything other than your patch panels
31 Leveraging MTP MTP connectors on everything.. Servers (40G) Switches (QSFP), including PLR/PSM 4x10G Patch panels Cassettes Allows for rapid field deployment Reconfigurable - direct path to 100G Inexpensive
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33
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35 ~3/30T of interconnect
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37 Every site has the same layout
38 Homogeny Allows us to make rapid deployment decisions Standardized negotiating for space and power depending on forecast Quick Bill of Material generation Signed to live in less than 30 days
39 2013
40 Layer 2/3 No opportunity for aggregation Big chassis is best Sticking to off-the-shelf platforms (for now!) Better to focus on software Developing our own routing platform No longer buying big expensive routers We ve had a traffic management platform for 8+ years
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42 And a similar network architecture (add and remove pieces)
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44 More info? Questions?
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