☁ Service Level Agreement – SLA #Cloud #Storage

Your Storage SLA Guide dark

A service-level agreement (SLA) is a part of a service contract[disambiguation needed] where a service is formally defined. Particular aspects of the service – scope, quality, responsibilities – are agreed between the service provider and the service user. A common feature of an SLA is a contracted delivery time (of the service or performance).

As an example, Internet service providers and telcos will commonly include service level agreements within the terms of their contracts with customers to define the level(s) of service being sold in plain language terms. In this case the SLA will typically have a technical definition in terms of mean time between failures (MTBF), mean time to repair or mean time to recovery (MTTR); identifying which party is responsible for reporting faults or paying fees; responsibility for various data rates; throughput; jitter; or similar measurable details.

A cloud storage SLA is a service-level agreement between a cloud storage service provider and a customer that specifies details of the service, usually in quantifiable terms.

A typical cloud storage SLA articulates precise levels of service – such as, for example, 99.9% uptime – and the recourse or compensation that the user is entitled to should the provider fail to provide the service as described. Another normal cloud storage SLA detail is service availability, which specifies the maximum amount of time a read request can take, how many retries are allowed and so on.

The SLA should also define compensation for users if the specifications aren’t met. Cloud storage service providers usually offer a tiered service credit plan that gives users credits based on the discrepancy between SLA specifications and the actual service levels delivered.

Most public cloud storage services provide details of the service levels that users can expect on their websites and these will likely be the same for all users. However, an enterprise establishing service with a private cloud storage provider may be able to negotiate a more customized deal. In this case an SLA might include specifications for retention policies, the number of copies that will be retained, storage locations and so on.

It’s important to read an SLA closely and examine the ramifications. For example, 99.9% uptime, a common stipulation, translates to nine hours of outage per year. For some mission critical data, that may not be adequate. You should also check to see how terms are defined.

Example:
Microsoft Azure Storage Section
Service Level Agreement (SLA)

msft sla for storage-1

Sample Full Microsoft Azure SLA -PDF

It is very important to review your SLA, Specially if you are running Servers which your customers depend their uptime. If you are reselling Storage and or Cloud services not only you as a customer of the Cloud Company get affected, but your customer will and that is when you will incur costs and expenses from multiple directions which will result in losses in profit.

 

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☁ Short Description of the 3 #Clouds #Storage

Cloud

The public cloud

The public cloud is a set of hardware, networking, storage, services, applications, and interfaces owned and operated by a third party for use by other companies or individuals. These commercial providers create a highly scalable data center that hides the details of the underlying infrastructure from the consumer.

Public clouds are viable because they typically manage relatively repetitive or straightforward workloads. For example, electronic mail is a very simple application. Therefore, a cloud provider can optimize the environment so that it is best suited to support a large number of customers, even if they save many messages.

Public cloud providers offering storage or computing services optimize their computing hardware and software to support these specific types of workloads. In contrast, the typical data center supports so many different applications and so many different workloads that it cannot be optimized easily.

The private cloud

A private cloud is a set of hardware, networking, storage, services, applications, and interfaces owned and operated by an organization for the use of its employees, partners, and customers. A private cloud can be created and managed by a third party for the exclusive use of one enterprise.

The private cloud is a highly controlled environment not open for public consumption. Thus, a private cloud sits behind a firewall. The private cloud is highly automated with a focus on governance, security, and compliance.

Automation replaces more manual processes of managing IT services to support customers. In this way, business rules and processes can be implemented inside software so that the environment becomes more predictable and manageable.

The hybrid cloud

A hybrid cloud is a combination of a private cloud combined with the use of public cloud services where one or several touch points exist between the environments. The goal is to combine services and data from a variety of cloud models to create a unified, automated, and well-managed computing environment.

Combining public services with private clouds and the data center as a hybrid is the new definition of corporate computing. Not all companies that use some public and some private cloud services have a hybrid cloud. Rather, a hybrid cloud is an environment where the private and public services are used together to create value.

A cloud is hybrid

  • If a company uses a public development platform that sends data to a private cloud or a data center–based application.

  • When a company leverages a number of SaaS (Software as a Service) applications and moves data between private or data center resources.

  • When a business process is designed as a service so that it can connect with environments as though they were a single environment.

A cloud is not hybrid

  • If a few developers in a company use a public cloud service to prototype a new application that is completely disconnected from the private cloud or the data center.

  • If a company is using a SaaS application for a project but there is no movement of data from that application into the company’s data center.

 

 

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Published by Wiley

 

Published by Wiley, this VMware Special Edition of Virtualization 2.0 For Dummies can be downloaded
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