openstack/watcher-specs
Code Issues Proposed changes

update improve-compute-data-model spec

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update some field names and add new property
Because resource usage is not stable field,
so remove it from the Data Model.

Partially Implements: blueprint improve-compute-data-model

Change-Id: I6d5da58272d33d6b867c2da3f709b1506401568f
This commit is contained in:
licanwei 2019-08-07 17:27:28 +08:00
parent cd6c31a197
commit 26f3881d8f
1 changed files with 18 additions and 15 deletions
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33
specs/train/approved/improve-compute-data-model.rst
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@ -34,45 +34,48 @@ Proposed change
Now Watcher had added `Placement helper`_. Watcher can get resource
information such as total, allocation ratio and reserved information
from API `list resource provider inventories`_,
and resource usage from API `list resource provider usages`_.
from API `list resource provider inventories`_.
Watcher ComputeNode
-------------------
We need to add some fields to the Watcher ComputeNode:
* vcpus_used: the number of vcpu used in this node.
* cpu_reserved: The amount of cpu a node has reserved for its own use.
* cpu_ratio: CPU allocation ratio.
* memory_mb_used: The memory used in this node(in MiB).
* vcpu_reserved: The amount of cpu a node has reserved for its own use.
* vcpu_ratio: CPU allocation ratio.
* memory_mb_reserved: The amount of memory a node has reserved for
its own use.
* ram_ratio: Memory allocation ratio.
* disk_gb_used: The disk used in this node(in GiB).
* memory_ratio: Memory allocation ratio.
* disk_gb_reserved: The amount of disk a node has reserved for its own use.
* disk_ratio: Disk allocation ratio.
We can calculate the free resource through the total, reserved, used and
We can calculate the total resource capacity through the total, reserved and
allocation ratio.
The formula:
free = (vcpus-cpu_reserved)*cpu_ratio-vcpus_used
vcpu capacity = (vcpus-vcpu_reserved)*vcpu_ratio
For example, for vcpu resource with:
::
vcpus = 8
vcpus_used = 16
cpu_reserved = 2
cpu_ratio = 5.0
vcpu_reserved = 2
vcpu_ratio = 5.0
The free vcpus is (8 - 2) * 5 - 16 = 14.
The vcpu capacity is (8 - 2) * 5.0 = 30.
We also add some new propeties to the Watcher ComputeNode:
* vcpu_capacity: The amount of vcpu, take allocation ratio into account,
but do not include reserved.
* memory_mb_capacity: The amount of memory, take allocation ratio into
account, but do not include reserved.
* disk_gb_capacity: The amount of disk, take allocation ratio into
account, but do not include reserved.
.. _Placement helper: http://specs.openstack.org/openstack/watcher-specs/specs/train/approved/support-placement-api.html
.. _list resource provider inventories: https://developer.openstack.org/api-ref/placement/?expanded=list-resource-provider-inventories-detail#list-resource-provider-inventories
.. _list resource provider usages: https://developer.openstack.org/api-ref/placement/?expanded=list-resource-provider-usages-detail
Compute Data Model
------------------