Lecture 3 Flashcards
1
Q
What is a data centre?
A
- Is a space for companies to keep and operate their IT infrastructure to support their business
- This includes serves, storage and equipment that run software and process and store data content
2
Q
Why do we care about data centres in cloud computing?
A
Providers’ perspective
Economies of scale;
- Cheaper electricity, hardware, network and operations
Users’ perspective
Infinite resources available on demand
- No upfront commitment
- Pay-as-you go model
3
Q
What has changed with the data centre hardware over the years?
A
- Commercial off-the-shelf (COTS)
- Custom layout
- Ultra dense servers
- System on chip (SoC)
- Resource Disaggregation
- Silicon Photonics
4
Q
What are first and second highest sources of expenditures in data centre costing?
A
- First generation was in late 2000 –
Key goal: Performance and availability
- Second generation was Google 2011
5
Q
How to improve the energy costs in data centres?
A
-
Raise the temperature of the aisles
- Usually 18-20 C
- Reduce conversion
- Replace expensive chillers with cooling tower to remove heat from water
6
Q
What is the bandwidth oversubscription in data centre networking?
A
200-400 Gbps
