January 2018
Intermediate to advanced
574 pages
14h 44m
English
Content preview from VMware vSphere 6.5 Cookbook - Third Edition
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How it works...
The following rules are available for the VM-host affinity rules:
- Must run on hosts in a group
- Must not run on hosts in a group
- Should run on hosts in a group
- Should not run on hosts in a group
The key difference is that for a must rule, it is mandatory to adhere to it, immaterial of the availability situation in the cluster. For instance, if a rule governs that a set of VMs must run on specific hosts and those hosts fail, the VMs would remain down.
A should rule preferentially keeps the VM based on the affinity or anti-affinity; however, it overrides the rules when there is a host failure and restarts the VM. This implies that availability overrides the affinity.
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