Other Redundancy and Safety Considerations

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Time
12 hours 57 minutes
Difficulty
Intermediate
CEU/CPE
13
Video Transcription
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>> Now we're going to continue to
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discuss many of the redundancy,
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safety, and design considerations
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when it comes to data centers.
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In this lesson, we're going to describe
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the important considerations when evaluating
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a cloud provider's redundancy
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and many of the design elements.
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We also want to talk about
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important considerations when evaluating
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the redundancy aspects of
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a cloud provider and the environmental
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considerations when
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maintaining availability in a data center.
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We previously discussed the need for
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power redundancy to ensure and maintain
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the availability of the data center
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itself as well as the hardware elements.
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But now we're going to talk more
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specifically about some of
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the important aspects of
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the design and the physical environment.
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The image you see here on the left is of
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a data center room.
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The very important thing to notice is
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that the servers are set
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up in a way that they pull in
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cool air in the front and
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>> push out warm air in the back.
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>> The data center is set up in a way to create what
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is referred to as hot and cold aisles.
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This efficiently manages this process
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of pushing cool air into the server and
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its fans blow out the hot air produced by
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the components running out the back and
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that is then sucked down our return.
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This helps maintain the
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>> optimal temperature environment.
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>> Now, what is that optimal environment?
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Well, that standard is set
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by the American Society of Heating,
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Refrigeration, and Air-Conditioning Engineers,
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also referred to as ASHRAE.
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The ASHRAE standard is
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64-80 degrees Fahrenheit in terms of
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the temperature and 18-27 degrees Celsius.
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Now this is very important
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because if the temperature is too hot,
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the machines won't perform optimally,
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and they may overheat causing availability issues.
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If the temperature is too cold,
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the people working there will find it largely
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uncomfortable to keep doing their jobs.
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They may make mistakes.
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Another environmental consideration is
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the humidity in the data center.
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The relative humidity should be at 60 percent.
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Now humidity refers to the
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>> amount of moisture in the air.
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>> This is very important if you're
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talking about electric components.
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If the humidity is too high,
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then these electrical components
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will begin to accumulate some small amount of
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moisture which will cause corrosion
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and damage them slowly over time.
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If the humidity is too low,
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meaning the air is very dry,
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that can actually cause static electricity to build up,
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which can lead to sparks and
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potentially cause a fire in the data center.
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Speaking of fire, really having
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a redundant and effective fire suppression system
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in the data center is very important.
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Unlike other tests, the CCSP doesn't really go into as
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much of detail when it comes to
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fire suppression and the piping system.
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But one of the things it does talk about
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is different methods of fire suppression.
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The different types of
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fire suppression are categorize as A,
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B, C, and D. Now,
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the way to remember what
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a fire suppression system is good
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for is through the terminology of ash,
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boil, current, dilute, A,
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B, C, D. Ash.
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This is used on
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flammable combustible materials that
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burn in your typical way.
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Oil. This is related to
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different liquids that could be flammable.
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Current, that is for use on electrical equipment,
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and dilute is related to chemical spills and exposures.
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Quiz question. A relative humidity
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of 60 percent in a data center lowers
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the risk of all the following except
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: fire caused by static shock,
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corrosion, conditions not conducive to human health.
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If you said condition is not conducive to
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human health, that's correct.
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The humidity is really related to this risk of
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corrosion and causing fire based on static shock.
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Temperature was really the main environmental metric
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when it comes to helping
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the hardware cool off properly and also
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maintain habitable conditions for
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the people working in the data center.
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[NOISE] In summary, we talked about
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a lot of the environmental
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and design aspects of the data center.
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We talked about the efficiency of having
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hot and cold aisles to maintain the optimal temperature
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by leveraging the design of
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hardware where it's pulling in
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cool air and expelling hot air.
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Then we also talked about the ideal bands of
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temperature for a data center
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>> to maintain the equipment,
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>> as well as the morale of the employees.
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Also talk to the importance of measuring
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humidity levels in the data center to prevent
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static shocks or the equipment
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itself from degrading because it becomes corroded.
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Then we talked about the different types
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of fire suppression devices.
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Remember that ash,
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boil, current, and dilute.
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Remember the A, B, C, D fire suppression.
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I'll see you in the next lesson.
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