As promised during the earlier confcall today. Metric is an analytical, quantitive measurement intended to quantify the state of a process, service or system. A Key Performance Indicator (KPI) defines a set of focused values used to manage a process, service or system. These raw sets of values, which are fed to systems in charge of summarizing the information, are called indicators. A KPI is a Metric but a Metric is not necessarily a KPI. Andy From: fiware-cloud-bounces at lists.fi-ware.eu [mailto:fiware-cloud-bounces at lists.fi-ware.eu] On Behalf Of David Breitgand Sent: Tuesday, June 21, 2011 5:32 PM To: Alex Glikson Cc: fiware-cloud at lists.fi-ware.eu; fiware-cloud-bounces at lists.fi-ware.eu Subject: Re: [Fiware-cloud] Terms and Definitions -- YOUR INPUT IS NEEDED SLAs and SLOs -- [David, can you, please, provide a definition?] Service Level Agreement (SLA) is legally binding contract between a service provider and a service consumer specifying terms and conditions of service provisioning and consumption. Specific SLA clauses define non-functional aspects of service provisioning such as performance, resiliency, high availability, security, maintenance, etc., along with the agreed upon means for verifying SLA compliance, customer compensation plan that should be put in effect in case of SLA incompliance, and temporal framework that defines validity of the contract. SLAs, usually, come in two forms: (a) standard SLAs and (b) individual (customized) SLAs. In the former type of SLAs, the SLA clauses are standardized for all customers, in the latter type of SLAs, the clauses are developed through a negotiation process between the customer and provider. Service Level Objective (SLO) is a clause of an SLA that defines measurable technical artefact defining the target level of provisioning of a certain non-functional property of a service, for example, performance. Performance SLO may be defined to specify the required target level for average, maximum, and specific percentile (e.g., 95.5 percentile) of response times per transaction type in a transactional application, From: Alex Glikson/Haifa/IBM at IBMIL To: fiware-cloud at lists.fi-ware.eu Date: 21/06/2011 05:29 PM Subject: [Fiware-cloud] Terms and Definitions -- YOUR INPUT IS NEEDED Sent by: fiware-cloud-bounces at lists.fi-ware.eu _____ Please, see below the list of terms with their current descriptions for the HLDesc. Notice that I've refactored and/or consolidated some of the definitions. I've marked in blue places where I need your input. Of course, any other comments/suggestions are welcome. Thanks, Alex Infrastructure as a Service (IaaS) -- a model of delivering general-purpose virtual machines (VMs) and associated resources (CPU, memory, disk space, network connectivity) on-demand, typically via a self-service interface and following a pay-per-use pricing model. The virtual machines can be directly accessed and used by the IaaS consumer (e.g., an application developer, an IT provider or a service provider), to easily deploy and manage arbitrary software stacks. Platform as a Service (PaaS) -- an application delivery model in which the clients, typically application developers, follow a specific programming model to develop their applications and or application components and then deploy them in hosted runtime environments. This model enables fast development and deployment of new applications and components. Virtual Appliances (vApp, also referred to as "service") -- pre-built software solutions, comprised of one or more Virtual Machines that are packaged, updated, maintained and managed as a unit. Virtual appliances are typically packaged in an Open Virtualization Format (OVF), developed by Distributed Management Task Force (DMTF) standardization body. Key Performance Indicators (KPIs) -- quantifiable metrics reflecting the level of offered service with respect to specific non-functional requirements such as performance, availability, resiliency, etc. KPI is usually computed as a function of one or more low level metrics. KPIs may relate either to the long term measures of the service level where raw metrics are averaged and summarized over a long time scale to guide strategic decisions about the service provisioning, or short term measures of service level, triggering proactive optimization. Service Elasticity is the capability of the hosting infrastructure to scale a service up and down on demand. There are two types of elasticity -- vertical (typically of a single VM), implying the ability to add or remove resources to a running VM instance, and horizontal (typically of a clustered multi-VM service), implying the ability to add or remove instances to/from an application cluster, on-demand. Elasticity can be triggered manually by the user, or via an Auto-Scaling framework, providing the capability to define and enforce automated elasticity policies based on application-specific KPIs. SLAs and SLOs -- [David, can you, please, provide a definition?] Cloud Edge -- [Serge, can you, please, provide a non-recursive definition?] a set of devices at the edge of the cloud. May correspond to end-devices [Serge: not clear what is 'end-device'] or to a more complex structure like a home network with end-devices and a Cloud Proxy -- a special device located in the home network and offering storage and computing capabilities to the cloud applications so that they can use it as their agent close to the end-devices [Serge, please, specify the purpose instead of saying "agent"-- e.g., improved user experience, security, etc]. TCloud API -- [Fernando, can you, please, provide a concise, self-explanatory definition?] OCCI -- [Andy, can you, please, provide a definition?] Cloud Data Management Interface (CDMI) defines the functional interface that applications will use to create, retrieve, update and delete (CRUD) data elements from the Cloud defined by the Storage Networking Industry Association (SNIA) group _______________________________________________ Fiware-cloud mailing list Fiware-cloud at lists.fi-ware.eu <http://lists.fi-ware.eu/listinfo/fiware-cloud> http://lists.fi-ware.eu/listinfo/fiware-cloud -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.fiware.org/private/old-fiware-cloud/attachments/20110622/7fd1c2de/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/x-pkcs7-signature Size: 5213 bytes Desc: not available URL: <https://lists.fiware.org/private/old-fiware-cloud/attachments/20110622/7fd1c2de/attachment.bin> -------------- next part -------------- ------------------------------------------------------------- Intel Ireland Limited (Branch) Collinstown Industrial Park, Leixlip, County Kildare, Ireland Registered Number: E902934 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.
You can get more information about our cookies and privacy policies clicking on the following links: Privacy policy Cookies policy