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VMware: Latency Sensitive VMs and vSphere DRS

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VMware: Latency Sensitive VMs and vSphere DRS
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Some applications are inherently highly latency sensitive, and cannot afford long vMotion times. VMs running such applications are termed as being ‘Latency Sensitive’. These VMs consume resources very actively, so vMotion of such VMs is often a slow process. Such VMs require special care during cluster load balancing, due to their latency sensitivity.

You can tag a VM as latency sensitive, by setting the VM option through the vSphere web client as shown below (VM → Edit Settings → VM Options → Advanced)

By default, the latency sensitivity value of a VM is set to ‘normal’. Changing it to ‘high’ will make the VM ‘Latency Sensitive’. There are other levels like ‘medium’ and ‘low’ which are experimental right now. Once the value is set to high, 100% of the VM configured memory should be reserved. It is also recommended to reserve 100% of its CPU. This white paper talks more about the VM latency sensitivity feature in vSphere.

DRS support

VMware vSphere DRS provides support for handling such special VMs. If a VM is part of a DRS cluster, tagging it as latency sensitive will create a VM-Host soft affinity rule. This will ensure that DRS will not move the VM unless it is absolutely necessary. For example, in scenarios where the cluster is over-utilized, all the soft rules will be dropped and VMs can be moved.

Read the entire article here, Latency Sensitive VMs and vSphere DRS

via the fine folks at VMware!

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VMware VMware is the leader in virtualization and cloud infrastructure solutions that enable businesses to thrive in the Cloud Era. Customers rely on VMware to help them transform the way they build, deliver and consume Information Technology resources in a manner that is evolutionary and based on their specific needs. With 2013 revenues of $5.21 billion, VMware has more than 500,000 customers and 75,000 partners. The company is headquartered in Silicon Valley with offices throughout the world and can be found online at www.vmware.com.

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