Chapter 01: Data Center Concepts Flashcards
What are the four simplified stages of designing a new mission-critical data center or upgrading an existing one?
- Risk Analysis
- Problem Definition
- Solution Development
- Implementation
_______ is defined as the relative importance of a function or process as measured by the consequences of its failure or inability to function.
Criticality
True or False: All risks cannot be eliminated; the most significant threats and impacts can be mitigated through choices made during the design and planning phase.
True
Define Availability.
Availability is the probability that a component or system is in a condition to perform its intended functions.
What is the mathematical equation for availability?
Availability = Uptime / (Uptime + Scheduled Downtime + Unscheduled Downtime)
List 3 examples of unscheduled downtime events.
- Repairs due to failure.
- Maintenance delay
- Facility-related failures/outage
List the three factors that are used to determine Availability Class and the function and features of data center services.
- Operational Requirement
- Operational availability
- Impact of downtime
What must first be defined, in order to determine the Availability Class associated with the mission-critical data center services.
The data center’s intended operational requirement.
In this operational level, functions are available for less than 24 hours a day and less than 7 days a week. In addition, there are more than 400 hours of available for planned maintenance shutdown.
Operational level 0
Which operational level functions 24 hours a day, 7 days a week, 52 weeks a year, with zero scheduled maintenance downtime available?
Operational level 4
When is a data center considered “available?”
When the ITE is operational and able to perform its function.
Define operational availability.
Operational availability refers only to scheduled uptime, the time during which IT functions are expected to run.
What 5 classifications are used to describe the impact of downtime?
- Isolated
- Minor
- Major
- Severe
- Catastrophic
What type of downtime is local in scope, affects a single site, and causes minor disruption to organizational functions?
Minor
__________ increases reliability by providing redundancy for critical high-risk, low-reliability components within systems.
Component redundancy
What is the role of system redundancy?
System redundancy further increases reliability by providing redundancy at the system level.
Higher quality components with lower failure rates will result in systems that are __________ reliable.
More
True or False: MTBF is a major factor in the determination of system reliability.
True
What is the objective of Availability Class 1?
The objective is to support the basic environment and energy requirements of IT functions.
__________ refers to reducing the risk of downtime by protecting against external events such as physical forces, security breaches, and natural disasters.
Survivability
During Availability Class 2, what is the system redundancy?
None
What is the targeted availability for Class 3?
99.99%
What is the objective for Class 4 Availability?
To eliminate downtime through the application of all tactics to provide continuous operation, regardless of planned or unplanned activity.
True or False: The data center should be classified only as a facility or building. It should not be looked upon as a collection of services that support the critical business process.
False
Describe the managed service outsource model.
A managed service is used when a business has an existing data center with sufficient redundancy, capacity, and security to meet the business needs, but does not want to maintain the staff required to operate the data center. The business will contract an external vendor to operate the facility and possibly the hardware. The facility and hardware are owned and controlled by the business.
What is the value of managed services?
Manage services can allow businesses to reduce or eliminate staff resources that are required to support the data center infrastructure.
True or False: Cloud Services model differ from the SaaS or PaaS because it is not defined as an outsourcing model.
True
What model consists of the business owning and managing the applications and OS/middleware, while the external vendor owns and manages the data center facility and hardware?
Infrastructure as a Service (IaaS)
What model is described below? The business leases the computer room capacity from an external data center vendor, while the external vendor provides physical security, floor space, power, cooling, and the ability to connect to one or more network service providers. The business owns and manages all IT hardware, applications and OS/middleware.
Colocation Services
True or False: The amount of control that the business has over the infrastructure, applications and data is increased as the model moves from the internal IT model to the SaaS model.
False
What redundancy level consists of a public cloud service vendor that provides virtual redundancy within a single physical data center?
Virtual redundancy level
What do public cloud service vendors provide
All the data center service layers for the applications they support for the customer.
