Availability refers to the ability of an organization to deliver consistent, predictable access to applications and data.
The number of catalog requests per minute is the key criterion for determining the size of the architecture as small, medium, or large. This criterion is much more important than the number of users in the system or other criteria. The higher the number of catalog requests per minute, the larger the recommended architecture.
A cluster is two or more interconnected computers that create a solution to provide higher availability, higher scalability, or both.
Clustering for CA Service Catalog and Accounting Component is accomplished through Catalog Component clustering, because all user communications with catalog and accounting functions are accomplished through Catalog Component. Thus, the term Catalog Component clustering includes both CA Service Catalog clustering and Accounting Component clustering.
Load balancing means dividing the amount of work between two or more computers, instead of a single computer. As a result, the system accomplishes more work in the same amount of time and typically serves all users faster.
In horizontal clustering (clustering), different physical computers comprise a cluster. As a result, the load balancer forwards requests to different computers having different IP addresses. All Catalog Component installations on all computers must use the same cluster of the MDB. To implement clustering, you make several related configuration changes manually. Clustering enables a single application to span several computers while presenting a single system image. Clustering can also provide increased throughput and high availability. Clustering applies to both Catalog Component and CA Workflow.
Note: If you are using CA Process Automation as your process automation tool, see your CA Process Automation documentation for information about using clustering with CA Process Automation.
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