In this video, Russ Long dives into the details of the DRS metric calculation. Learn the math behind DRS thresholds and how you can alter advanced parameters.
- [Instructor] Since migration thresholds…are the magic that make DRS work,…let's take a moment to jump down the rabbit hole.…First, let's go to the math to get some…of these values in a more concrete manner.…The first thing DRS does is figure out what the loads…are on each host using the formula:…sum, or loads expected, divided by the capacity of hosts.…Next, DRS needs to figure out the standard deviation…in the cluster.…This is fairly straight-forward, since we already know…the loads of each host in the cluster.…
We now take the value and find the variation,…or dispersion, that exists among the hosts.…This gives us our standard deviation.…Once completed, we inject both of those values…into the formula at the bottom.…Six minus the ceiling function, multiplied…by LoadImbalanceMetric, that's the one we got earlier,…divided by 0.1, multiplied by the square root…of the number of hosts in the cluster.…
Now I know you feel better about how DRS is calculated.…But in all honesty, you will probably never…be asked about this.…
Author
Russell Long
Released
12/21/2016- An overview of DRS
- Migrating virtual machines and thresholds
- Configuring DRS
- Creating and editing clusters
- Working with Storage DRS cluster features
- Managing DRS cluster resources
- Enabling Distributed Power Management
- Troubleshooting DRS
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome50s
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1. DRS Overview
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DRS basics4m 1s
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DRS cluster requirements6m 14s
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Lab introduction2m 43s
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2. Inner Workings of DRS
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Migrate virtual machines4m 22s
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Migration thresholds4m 54s
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DRS cluster validity3m 22s
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3. Configuration of DRS
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Create and edit DRS clusters6m 44s
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Automation levels for VMs3m 25s
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Storage DRS3m 47s
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Storage DRS runtime rules2m 16s
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Storage DRS: Demo5m 45s
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Schedule DRS: Demo4m 11s
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4. Managing DRS Cluster Resources
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DRS maintenance mode4m 17s
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VM to VM rules4m 27s
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VM to host rules5m 50s
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Monitor DRS6m 57s
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5. Distributed Power Management
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Distributed Power Management5m 32s
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Enable DPM3m 55s
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Monitor DPM4m 7s
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6. Troubleshooting DRS
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DRS host troubleshooting3m 13s
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DRS VM troubleshooting4m 57s
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Conclusion
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What's next?18s
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Video: Migration thresholds