Milan, 10 September 2009 www.sensiblecloud.com
SLAs: Are Clouds Ready for Primetime? francesco.mondora@sensiblecloud.com
in collaboration with:
© 2009 sensible cloud

HOW CAN YOU TRUST A COMPUTING ENVIRONMENT?
• an exhausted resource is un-delegable
• unlimited poor resources are still poor resources
• capacity planning predicts short term loads
• low level resources or services should relax a bit
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HOW DO WE PERCEIVE THE CLOUD?
• a federated set of heterogeneous resources
and services
• a reliable computing environment
• a resilient system across the internet
• a private to public computing space
• the whole application stack (from applications to
hardware)
• you don’t know where or what you’re running on
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HETEROGENOUS SERVICES
services are heterogeneous and
more generally a service should:
• add value in business terms and goals
• be available in some combination of Components
local, hosted, and in the cloud Application
• provide an API to be invoked OS
• be able to invoke other services through
APIs Virtualization
• provide a Service Level Agreement Hardware
(SLA) that describes how well it is
performing against target
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Application
API
API SLA
Components SLA
service federation API
SLA OS
API
Virtualization SLA
API
SLA
Hardware
SERVICE LEVEL AGREEMENT
• every service inside a cloud must declare an SLA
• SLAs should contain business valuable objectives (not just technical)
• an SLA is the measurement of how well the service is performing
against target within the cloud
• an SLA identifies the runtime ‘health’ of a service
• an SLA defines action to be performed when services are stressed or
exhausted
• services self-federate
• intelligent routing within the federation directs to the best service
• services are responsible for declaring and providing their service level
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protected cloud
internal cloud
public cloud
INTER-CLOUD SLA BROKER
• Agreements between services are managed through a
secure intra-, & inter-cloud federation;
• SLAs protect and drive the computing model (peer-to-
peer computing) directing invocation to the best service
provider(s) within the cloud;
• When systems overload/relax, business SLAs may be
violated and action can be taken (ex. Provision/Un-
provision new service on the cloud)
© 2008 sensible cloud sensible cloud Confidential www.sensiblecloud.com - info@sensiblecloud.com

CONCLUSIONS
• Inter-cloud SLA broker ties technology and
protocols together
• Systems can adapt business needs over
trusted relationship
• SLAs are the link across clouds that make
business sense of the cloud
© 2008 sensible cloud sensible cloud Confidential www.sensiblecloud.com - info@sensiblecloud.com

THANKS
feel free to contact me:
Francesco.Mondora@sensiblecloud.com
or follow me:
twitter.com/makkina
© 2008 sensible cloud sensible cloud Confidential www.sensiblecloud.com - info@sensiblecloud.com