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Using TOSCA Requirements /Capabilities to Specify Capacity Resources (Primer Considerations)

Using TOSCA Requirements /Capabilities to Specify Capacity Resources (Primer Considerations) . Proposal by CA Technologies, IBM, SAP, Vnomic. Resource Types. Common (Capacity and Consumption) CPU capacity (in portable units such as SPECint2006_rate) Memory (virtual or physical)

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Using TOSCA Requirements /Capabilities to Specify Capacity Resources (Primer Considerations)

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  1. Using TOSCA Requirements /Capabilities to Specify Capacity Resources(Primer Considerations) Proposal by CA Technologies, IBM, SAP, Vnomic

  2. Resource Types • Common (Capacity and Consumption) • CPU capacity (in portable units such as SPECint2006_rate) • Memory (virtual or physical) • Storage (local disk, SAN, NAS) • Bandwidth (network) • Other • Workload types, Abstract resources • Constraints in environment and other elements

  3. Typical Use Case • Typical use case • Specify the resources, capabilities and their characteristics to (re)deploy a service in a cloud environment (see supplemental section) • Can be effectively expressed using proposed requirements/capabilities framework • Resources of a Service • Sum of all included elements in that service (per resource type)

  4. Specifying Resource Requirements • Definitions needed • CapabilityType(s) for resources such as Memory, CPU, Storage, etc. • NodeType(s) and NodeTemplate(s) to express requirements against the hosting resources • May be specified as ‘hints’ or requirements • Number and types of nodes are implementation dependent • Single, multiple locations, availability zones, … • Need to define semantics

  5. Resources as Capabilities Predefined by TOSCA <NodeTemplate id="uid-host" nodeType="tcore:Host"> <Capabilities> <Capability is="uid-resources-memory" name="myMemory"> <Properties> <Memory>128</Memory> </Properties> </Capability> <Capability id="uid-resources-compute" name="myCompute"> <Properties> <SpecInt2006Rate>100</SpecInt2006Rate> <CPU_MHZ>4</CPU_MHZ> <NCPU>64</NCPU> </Properties> </Capability> <Capability id="uid-resources-storage-SAN" name="myStorage"> <Properties> <Storage>5000</Storage> <Luns>10</Luns> </Properties> </Capability> </Capabilities> </NodeTemplate> Unit is defined in CapabilityType for Memory Max capabilities for Node Multiple properties per Capability

  6. Resources Requirements Defined by Capability <Requirements> <Requirement ref="uid-resources-memory“ name=“memory1> <Properties> <Memory lowerBound="4" upperBound="16" typical=”8”/> </Properties> </Requirement> <Requirement req="uid-resources-compute“ name=“CPU1”> <Properties> <SpecInt2006Rate lowerBound="10" /> </Properties> </Requirement> <Requirement ref="uid-resources-storage-SAN“ name=“storage1> <Properties> <Storage lowerBound="100" upperBound="200" /> <LunslowerBound="1" /> </Properties> </Requirement> </Requirements> For better matching Multiple property match

  7. Remaining Comments and Where we Left Them

  8. Remaining Comments & Suggestions • Requirement definitions should support Unit & Type to accommodate capability type of resources such as CPU & memory. • Agreed, needs specifics

  9. Remaining Comments & Suggestions 2 • Consider requirement phases • Initial requirements • Needed before a node can be instantiated • Operational requirements • Needed to satisfy changing demands; scaling up/down • Example: • <Requirements type=”initiation”> • Agreed. Needs further discussion

  10. Remaining Comments & Suggestions 3 • The Requirement to Capability matching needs to be further defined or extended • How will one express a requirement of • Tomcat version 5.0 and above? • Need for a SQL92 compliant database Server? • Need to define additional semantics • Could possibly borrow subset of OASIS SDD • A more detailed proposal is needed

  11. Examples of Property Syntax and Matching Requirements • Type + Property syntax to match: • Exact value: property A must be ‘X’ • One of enumerated value: property A must be 1 or 5 • In range (min, max):property A must be between 1 and 10 • Regex match: property A should match 5.* (* is wild character) or string ‘5.*’ • More complex expressions: Composite, hints/recommendations, “relaxed matching”, …

  12. Supplemental Material

  13. Use Case Description

  14. Preferred Initial Process Flow

  15. Preferred Ongoing Process Flow

  16. Error Flow and Variations

  17. OASIS SDD (Solution Deployment Descriptor) • SDD v1.0 is an OASIS standard (as of 2008) • Limited update? Suitability? What can we learn/borrow? • Example:

  18. SDD Semantics - 1 • CapacityConstraint • Constraints on the available capacity of a particular property of a particular resource. Ex: CPU speed • ConsumptionConstraint • Constraints on the quantity of a particular property of a specific resource that is available for consumption. Ex: disk space • PropertyConstraint • A specific resource properties must have a specific value or set of values. Ex: OS=Linux • VersionConstraint • Constraint on the version of a specific resource. Ex: Version=1.1, MinVersion=1.0 • This can be expressed using Capability/Requirement Type + constraints

  19. SDD Semantics - 2 • UniquenessConstraint • When two resources defined in topology MUST or MUST NOT resolve to the same resource instance during a particular deployment • RelationshipConstraint • Constraint on a particular relationship between resources • AuthorizationConstraint • A required level of authorization required by a resource in order to deploy the content • This needs further discussion

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