DATA CENTRES MANAGEMENT AND OPERATION
1
0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
Initial event is random
Eventually,
inevitably there will be another failure
Risk reduces with experience
With experience continue to reduce to minimum
0.001
0.01 Probability of failure vs time
Probability of failure Statistics for the data centre industry also suggest that human error is the root cause of most outages. Data centres are typically designed with resilient topology to improve availability, however it is impossible to entirely design out human operators. In some cases, redundant infrastructure design can make the systems and interactions highly complicated, making them more difficult to operate and potentially increasing the likelihood of misoperation, rather than improving reliability. While operational team performance improves with experience and training, 100% uptime remains an aspiration and failure can never be completely eliminated.
Response to failure In recent years, the data centre industry has focused on energy-efficiency facing policy, corporate social responsibility and financial pressures. Similarly, energy performance can be improved as experience and understanding grows. Data centre operators are often reluctant to consider making improvements to their energy efficiency due to fears about what this could do to their reliability. This is understandable given the ‘mission critical’ nature of most facilities; having confidence that facility risks are well managed takes priority. However, there are plenty of improvements
Google’s Douglas County data centre in Georgia
that can be implemented to safely reduce energy consumption, some of which also improve reliability. For example, in the case of data hall air management, removing hot spots reduces the likelihood of hardware failure and allows operating temperatures to
www.cibsejournal.com
Data centre operators are often reluctant to consider making improvements to their energy efficiency due to fears about what this could do to their reliability
0.1
1
10
100 10,000 10,000 100,000 1,000,000 Increasing experience (for the homo-technological system)
Impact of organisational and individual depth of experience on failure rate and energy wastage
Failure rate
Energy wastage
Where are your operators?
Where is your organisation?
April 2013 CIBSE Journal 35
Accident probability (increasing risk)
Accumulated experience (organisation)
Depth of experience (Operator)
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