Tag Archives: live migration

Jetstress Performance Testing on Nutanix Acropolis Hypervisor (AHV) – Part 2 – Performance after a VM Migration

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This is Part 2 of the Jetstress performance testing on Nutanix Acropolis Hypervisor (AHV) series of videos.

This video shows the following:

  1. Jetstress performance after the VM is migrated from the node the Databases were created, too another node in the NDSF cluster.

This test is the first of several to show the impact to performance by migrating VMs to nodes in the same cluster where not all data is stored locally. This is demonstrated by the advanced reporting capabilities of NDSF.

Note: As with previous videos, This demonstration is not showing the peak performance which can be achieved by Jetstress on Nutanix.

Part 2

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Acropolis Hypervisor (AHV) & non-uniform node CPU generations

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For those of you familiar with VMware vSphere’s Enhanced vMotion Compatibility (EVC) feature, you might be wondering how non-uniform CPU generations are handled in an Acropolis Hypervisor (AHV) environment.

Well, as with most things Nutanix, the answer is simple.

NOS 4.5 automatically detects and configures the lowest common CPU generation as the baseline on a per cluster basis.

The following diagram shows how it works:

AHVEVC2

As we can see, we have a four node Acropolis cluster with 3 different CPU generations. Acropolis detects Sandy Bridge as the lowest common denominator and ensures VMs on all nodes are only exposed the Sandy Bridge CPU capabilities.

This ensures Live migration capabilities are maintained across the cluster.

Note: As with vSphere’s EVC, VMs still benefit from higher clock rates and performance from newer generation CPUs, they just don’t have all CPU capabilities exposed, so don’t be fooled into thinking your newer/faster CPUs are wasted in a mixed environment.