Tier standards for data centers are defined by levels of availability and downtime per year. Tier I has the lowest availability at 99.671% with 28.8 hours of annual downtime and no redundancy. Tier II has 99.741% availability and 22 hours of downtime with redundant components. Tier III provides 99.982% availability and 1.6 hours of downtime with dual power and no single points of failure. Tier IV is the highest tier with 99.995% availability and 0.8 hours of downtime, offering fully fault tolerant systems. While a higher tier ensures greater reliability, organizations should select the tier that matches their budget and criticality of the data and applications.

1. TIER STANDARDS IN DATA
CENTER, ARE YOU SURE ABOUT
THEIR DIFFERENCES?
B Y : V A I S H N A V I K U L K A R N I
E S D S S O F T W A R E S O L U T I O N S P V T. L T D .

2. INTRODUCTION
• We are already steering towards change with digital
evolution all over and with this we can be
manipulated easily with number of services all over
claiming to be best.
• Tier level certifications for Datacenters are one
such thing. Basically Tier defines the levels of
availability of data from the DC to the requested
location.
• Availability is defined by the level of tiers, higher is
better.

3. • Tier standards falls under TIA and
Uptime institute LLC.
• The goal of Tier standards is
nothing but the standardized
approaches for defining uptime
and data security of the data
centers
But What is difference between these
Tier levels?
INTRODUCTION

4. Here are the features and availability of data center Tier level
descriptions of tier certifications.
Tier IV
Tier III
Tier II
Tier I

5. TIER I
• Basic category of
certification
• 99.671 % uptime per
year
• 28.8 hours of average
disruption in the year
• No redundant capacity
components
• Suitable for Small
Businesses
• Not for critical
application
Tier IV
Tier III
Tier II

6. TIER II
• Second category of Tier
standards, it includes all
features of Tier I
• 99.741 % uptime per year
• 22 hours of average
disruption in the year
• Redundant capacity
components
• Suitable for Medium sized
Businesses
Tier IV
Tier III
Tier I

7. TIER III
• Third category of Tier
standards, it includes all
features of Tier I + Tier II
• 99.982 % uptime per year
• 1.6 hours of average
disruption in the year
• Dual powered system
• Suitable for Large sized
Businesses
Tier IV
Tier I
Tier II

8. TIER IV
• Topmost category of Tier
standards, it includes all
features of Tier I + Tier II +
Tier III
• 99.995 % uptime per year
• 0.8 hours of average
disruption in the year
• Fully Fault tolerant
system
• Suitable for Enterprises Tier I
Tier II
Tier III

9. MYTHS ABOUT TIER III
• DC providing 99.982% does not necessarily
means Tier III certified Data center
• Tier III has no single points-of-failure
• Fault tolerance of Tier III is higher than Tier
II
• A Tier rating is aggregate (Tier III.5, Tier
III+)
• Tier mandate location, security and
operations

10. WHEN CAN BE RIGHT TIME TO CHOOSE TIER III?
• When the data to be stored is sensitive and
requires secure hosting.
• Need of mission critical businesses or high priority
operations that are proportionally related with
financial aspects and may lead to losses if there
are disruptions in power.

11. TIER III OR TIER IV ?
• This is one of the common confusion, this makes
providers a reason to present their services as
best.
• Tier III and IV are not just data center centric but
they are complete infrastructure centric.
• Logically speaking tier IV is the best of all but it’s
not at all logical always to invest heavy costs in it
when we have a reasonable option available.
• Tier III provides with maximum required features in
lower costs

12. OVERVIEW OF TIER STANDARDS

13. CONCLUSION
• Maximum the tier level minimum the downtime is the basic theory behind.
Complexities, performance, CAPEX and OPEX increase with each tier level.
• Depending on the business size, budgets and requirement, it is logical to
choose suitable certified Data Center.
• In case of any further doubts feel free to contact relationship@esds.co.in

14. SOURCE
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