Affinity rules

An affinity rule is a setting that establishes a relationship between two or more VMware virtual machines (VMs) and hosts.

Affinity rules and anti-affinity rules tell the vSphere hypervisor platform to keep virtual entities together or separated. The rules, which can be applied as either required or preferred, help reduce traffic across networks and keep the virtual workload balanced on available hosts. If two virtual machines communicate frequently and should share a host, the VMware admin can create a VM-VM affinity rule to keep them together. Conversely, if two resource-hungry VMs would tax a host, an anti-affinity rule will keep those VMs from sharing a host. you can configure them using DRS.

Affinity rules and anti-affinity rules can be applied between VMs and hosts as well, and a VM can be subject to VM-VM affinity rules and VM-Host affinity rules at the same time. Affinity and anti-affinity rules in a vSphere environment can conflict with one another. For example, two VMs with an anti-affinity relationship may both be linked to a third VM via an affinity rule, but they cannot share a host. Optional affinity rule violation alarms can alert administrators to these events.

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Understanding VMFS Datastores

I have gone through vSphere 5.5 Storage Documentation and find some useful information, so i thought to share with you some key points.

Datastores are logical containers and datastores can also be used for storing ISO images, virtual machine templates, and floppy images.

Different VMFS versions and their compatibilities with ESX/ESXi hosts :

VMFS ESX/ESXi 3.x host ESX/ESXi 4.x host ESXi 5.x host
VFMS2 RO RO N
VMFS3 RW RW RW
VMFS5 N N RW

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VMware Online Technology Forum on the 15th of April

Hello Guys…

Register and Find out whats new with vSphere 6.0

join your peers at technology updates and a number of self-paced hands-on labs on the technologies driving IT efficiency and business advantage:

  • vSphere 6 – the Foundation for the Hybrid Cloud
  • Virtual SAN 6 and Virtual Volumes – What’s New?
  • Introducing VMware Integrated OpenStack
  • Enabling Micro-Segmentation with NSX
  • Introducing Hyper-Convergence with EVO:RAIL
  • App Volumes – Revolutionising Application Delivery

Full Agenda can be found here