Merge "api-ref: Further clarify placement aggregates"
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@ -7,14 +7,19 @@ resource providers in groups called aggregates. API calls in this
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section are used to list and update the aggregates that are associated
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with one resource provider.
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Provider aggregates are used for modeling relationships among providers.
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Examples may include:
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* A shared storage pool providing DISK_GB resources to compute node providers
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that provide VCPU and MEMORY_MB resources.
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* Affinity/anti-affinity relationships such as physical location, power failure
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domains, or other reliability/availability constructs.
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* Groupings of compute host providers *corresponding to* Nova host aggregates
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or availability zones.
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.. note:: Placement aggregates are *not* the same as Nova host
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aggregates and should not be considered equivalent.
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Provider aggregates are used for modeling relationships where a provider
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shares resources with one or more other providers. An example is a shared
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storage pool providing DISK_GB resources to other compute node providers that
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provide VCPU and MEMORY_MB resources.
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The primary differences between Nova's host aggregates and placement
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aggregates are the following:
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@ -37,8 +42,9 @@ aggregates are the following:
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providers are individually decorated with *traits* that provide
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qualitative information about the resource provider.
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* In Nova, a host aggregate dictates the *availability zone* within
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which one or more nova-compute services reside. Placement aggregates
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have no concept of an availability zone.
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which one or more nova-compute services reside. While placement aggregates
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may be used to *model* availability zones, they have no inherent concept
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thereof.
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.. note:: Aggregates API requests are availiable starting from version 1.1.
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