[GitHub] nvazquez opened a new pull request #2189: CLOUDSTACK-10006: Internal DRS-like load balancing implementation for Vmware

[gi...@git.apache.org]

nvazquez opened a new pull request #2189: CLOUDSTACK-10006: Internal DRS-like load balancing implementation for Vmware
URL: https://github.com/apache/cloudstack/pull/2189
 
 
   JIRA TICKET: https://issues.apache.org/jira/browse/CLOUDSTACK-10006
   
   ## Introduction
   One of the most useful features provided by Vmware is DRS (Distributed Resources Scheduler), whose main job is to load balance workload within clusters when needed (given a migration threshold). However, this feature is only available for Enterprise Plus licenses. We would like a way to provide a similar feature internal to CloudStack for those Vmware licenses which don't have DRS feature available.
   
   ## Usage
   This feature is disabled by default, it can be activated by switching global setting: `vmware.drs.internal.enabled` to `true` (management server restart is required).
   When feature is active, it would set a a thread per cluster which will execute every `vmware.drs.interval` seconds:
   
   - If cluster setting: `vmware.drs.internal.enabled = false` -> no action performed on cluster
   - If cluster setting: `vmware.drs.internal.enabled = true`:
      - Get cluster hosts statistics and calculate cluster imbalance
      - While cluster imbalance > `vmware.drs.threshold`:
         - If no good migration is found -> stop
         - If good migration is found -> it is added to the list of recommendations
   
   Good migration search works like this:
   - For each VM v:
      - For each host h that is not Source Host:
         - Simulate move v to h
         - Measure new cluster-wide load imbalance metric as g
   - Return move v that gives least cluster-wide imbalance g.
   
 
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