The Distributed Resource Scheduler (DRS) ESXi cluster became unbalanced. Things to Check When Troubleshooting DRS. * A Cluster is Red Because of an Inconsistent Resource Pool. * DRS doesn’t move any virtual machines from a host. * A Virtual Machine Power On Fails. * Load Imbalances on a Cluster. I’ve listed a few reasons of an unbalanced cluster.
- VM/VM or VM/Host DRS rules prevent virtual machines to move.
- DRS is disabled for the machine.
- CD/iso files mounted that are local to a host.
- vMotion is not enabled or setup.
The Main DRS clustering features are Load Balancing, Distributed Power Management, and Affinity Rules. Three automation levels are available:
Manual — vCenter will only recommend moving resources.
Partially Automated — vCenter will automatically place the VM on the best host.
Fully Automated — vCenter is in control of initial placement and VM migrations.
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