Data Center Tiers

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Time
12 hours 57 minutes
Difficulty
Intermediate
CEU/CPE
13
Video Transcription
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>> This lesson we're going to be talking
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about data center tiers.
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When your business is moving to the Cloud and you
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need to pick an appropriate hosting provider,
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how do you know that
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the data center offers
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>> the right amount of availability,
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>> redundancy for your business?
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Well, we're going to get into that in this lesson.
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The learning objective for this lesson are to
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describe the important considerations
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when evaluating
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a Cloud provider's data center capabilities.
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We also want to talk about
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how to inform stakeholders about
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which data center tier is most
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appropriate for a given business case.
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When it comes to data centers,
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they're described in four different tiers.
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Each tier has its own strengths in terms
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of the amount of
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availability that the data center guarantees,
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the amount of fault tolerance,
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meaning when the power is disrupted,
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what mitigating controls or
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adaptive controls the data center has to
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ensure that it maintains power,
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heating and appropriate cooling measures
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regarding the data.
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Let's start at the bottom.
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Tier 1 is the lowest tier for a data center.
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It ensures 99.671 percent uptime so that
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really translates into only
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28.8 hours of downtime in a given year.
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Now, tier 1 data center only it really has
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one source of power and cooling.
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Tier 1 is really appropriate for a small business.
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There's only one signal path of power and cooling so
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the fault redundancy is
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really at the lowest level of maturity.
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There aren't necessarily redundant components
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if something were to go wrong
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but this also is going to be
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the lowest cost in terms of data center.
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Tier 2. Tier 2 ensures 99.7 percent uptime.
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They've shorten it in this case so that's
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22.7 hours of unexpected downtime in a given year.
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Data centers, I should say
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this uptime factor reflects unexpected downtime.
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It doesn't account for times that the data center may
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have planned outages related
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to updates and things like that,
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but those are typically done in off-peak hours.
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Tier 2 also has a signal path of power and
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cooling and some redundancy
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when it comes to its major power and cooling elements.
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This is really appropriate for a medium-sized business.
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Tier 3, this is starting to get a lot more serious.
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You can see the uptime really
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>> jumps from at 99.7 to 99.9.
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>> This guarantees what we call
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three nines of uptime guarantee,
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it's 99.9 percent uptime.
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There is fault tolerance in this data center,
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so if some of the elements fail or go wrong,
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it's able to maintain
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the data centers facilities integrity.
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Then it also has
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at least a redundant backup power source to
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maintain the power at
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the data center for at least 72 hours.
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This is really for many large companies.
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The unexpected downtime is only 1.6 hours.
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Now finally, to the ultimate tier, Tier 4.
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This is a fully fault-tolerant data center and it
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guarantees at least four nines of availability.
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Now, the gold standard,
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really when it comes to availability is five nines.
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For businesses that don't want to allow any type
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of unplanned outages or impact their customers,
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they really want to go for five nines,
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which really goes down to even six minutes
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of unplanned downtime.
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However, in terms of the tiers,
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tier 4 is the highest with 25 minutes
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of unexpected downtime in a given year.
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Then the other info about tier 4
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is that in terms of its fault-tolerance
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and redundancy is two independent utility paths
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to ensure that power is maintained at the data center,
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and then it also has the ability to
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sustain power outage for 96 hours.
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Tier 4 data center,
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obviously is the top tier.
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This is appropriate for multi-national businesses
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or businesses that
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really put or place a premium on
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their availability and its impact on our customers.
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Quiz question. You are a Cloud consultant helping
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a business determine the appropriate data
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center tier for their needs.
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This is a small business,
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but it needs at least 99.5 percent availability.
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Which of the following is the minimum
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appropriate data center tier
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for these requirements?
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I try to be a little tricky here.
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I'd said, it needs at least 99.5 percent,
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two nines of availability.
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However, based on our tiers,
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that actually is below
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even the amount of availability guaranteed
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by tier 1 data center
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and then also we'd said it's a small business,
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which is also appropriate for tier 1.
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In summary, we've talked about
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the four data center tiers.
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Talked about availability and fault
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tolerance considerations for each tier
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and then we also talked about business case
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regarding each tier.
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I'll see you in the next lesson.
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