A rule that separates workloads. In DRS a VM-VM version places the chosen VMs on separate hosts; in Storage DRS it places VMs, or the disks of one VM, on separate datastores.
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Each book explains Anti-affinity rule in context, with comparison tables and the common traps.
Terms in this definition
- DRS
The Default Rule Set, Microsoft's managed WAF rules that succeed OWASP CRS and defend against XSS, SQL injection and other frequent attacks. Single rules may be overridden or switched off.
- Virtual machines
Infrastructure-as-a-service compute giving complete control of the operating system, making it a fit for lift-and-shift moves and for software relying on OS-level pieces like COM.
- Storage DRS
Uses Storage vMotion and VMDK anti-affinity rules to choose where new VMs go and to keep space usage even across all datastores in a datastore cluster.
Related terms
- High Availability NSX Manager Model
Three NSX Manager nodes clustered behind an internal virtual IP. Every API request still goes to a single node, but the cluster stays available: nodes run on separate hosts thanks to an anti-affinity rule, vSphere HA brings back a failed one, and upgrading does not touch the control plane.
- High Availability VCF Operations Model
Losing one node is quickly recovered in this VCF Operations layout, which pairs a three-node analytics cluster with one collector and one fleet management appliance. Collector groups can later make collection more resilient; the layout requires at least four hosts in the default management cluster and a DRS anti-affinity rule.