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Service Groups
two types
- Failover
- -online on only one cluster system at a time
- -referred to as active/passive
- -most common type
- Parallel
- -online on multiple cluster systems simultaneoustly
- -referred to as active /active
- -Example: Oracle Real Application Cluster (RAC)
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Service groups
- is a container that enables VCS to manage an application serveice as a unit
- Resources
- Dependencies
- Attributes
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Resources
- correspond to the hardware or software components of an application service
- -have unique names thoughtout the cluster
- -are always contained within service groups
- -are categorized as:
- -persistent: never turned off
- -nonpersistent: turned on and off
- Recommedations:
- -match resource and service group names to easily identify all resources in a group
- -use a naming convention that identifies the service and type of resource
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Dependencies
- determine online and offline order of resources
- -determine parent/child relationships
- child comes up first than parent
- -are defined to be parent dependent on child
- -cannot be cyclical
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Resource types
- define characteristics of resources
- -specify the attributes
- -are used to create a resource
- -are similar to source code
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agents
- manage resources
- -corresponds to a resource type
- -manages all resources of that type
- -runs on each system with an active resource
- -has one or more entry points which perform set actions as resources
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failovers
- A/P
- A/A
- N:1-A/A and spare
- N:N-A/A/A- any one the host can host the applciation
- N+1- A/A/A-spare
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