chapter two Flashcards
the cloud ecosystem
what load balance in cloud computing should attempt?
to minimize energy consumption by concentrating the workload on the smallest amount of servers and putting the others in the energy-saving mode
system resources in a virtual environment are managed by what
by a hypervisor rather than one operating system
The scale of the cloud computing infrastructure has profound implications on cloud resource management forced to satisfy conflicting requirements. explain
on one hand, the system must be elastic, i.e., able to accommodate sudden spikes of workload and, on the other hand, minimize energy consumption
in the Nist reference model. what is the service consumer entity from the five entities involved?
maintains a business relationship with and uses the service from the service provider
in the Nist reference model. what is the service provider entity from the five entities involved?
the one that is responsible for making the service available to service consumers
in the Nist reference model. what is the carrier entity from the five entities involved?
intermediary provides connectivity and transport of the cloud services between the consumers and the providers.
in the Nist reference model. what is the broker entity from the five entities involved?
the one that manages the use, performance, and delivery of cloud services, and negotiates relationships between the consumers and providers
in the Nist reference model. what is the auditor entity from the five entities involved?
a party that can conduct independent assessment of cloud services, information system operations, performance, and security of the cloud implementation.
what the SAAS offers?
software as a service: enabling the users to access the application through the internet using a thin client interface without managing the underlying cloud infrastructure.
examples of SAAS’
enterprise services such as workflow management, communication, supply chain, digital signature, customer relationship service
What SAAS is not suitable for?
The SaaS delivery model is not suitable for applications requiring real-time response or those in
which data is not allowed to be hosted externally
what Paas offers?
platform as a service: offers the capability to deploy consumer-created or acquired applications using programming language and tools supported by the provider. The user does not manage or control
the underlying cloud infrastructure including the network
what Paas is not useful for?
- When the application must be portable,
- when proprietary programming languages are used,
- or when the underlaying hardware and software must be customized to improve the performance of the application.
what is the major application area for the Paas
in software development when multiple developers and users collaborate and the deployment and testing services should be automated.
What Amazon Web Services cloud delivery model is based on?
based on the IAAS delivery model which offers an infrastructure consisting of computation and storage servers interconnected by high-speed networks and supports a set of services to access these resources.
what is the difference between s3 and EBS
the data on s3 can’t be modified but we can store large data on it while the EBS we can modify the data but store a small not large data on it.
what are some danger that can face an organization of the cloud service
- maybe the service will be not avialable for a short time
- or it lost in a catastrophic system failure.
- or a “vendor lock-in’
what is a vendor lock-in
when a cloud service provider increases the price of the services or charges more for computing cycles and memory, storage, and network bandwidth
What a solution to problems posed by vendor lock-up
is to replicate data to multiple cloud service providers using RAID
is there a problem if the solution to the vendor lock-in is replicating all data to multiple service providers
yes, because it’s very costly, and maintaining data consistency could drastically degrade performance
what is RAID-5 in solving the problem of vendor lock-in
