Balancing loads between hosts
Distributed Resource Scheduler (DRS) is a feature designed to optimize VM placement between hosts in a cluster. It compares cluster resource utilization to the current demand. Based on that, it generates recommendations on VM placement. If configured to do so, it can perform VM migrations automatically according to these recommendations.
For example, a cluster on the left side of the diagram is not balanced. After applying DRS recommendations, host resources are utilized more efficiently.
Getting ready
The following requirements must be met before hosts can be joined to the DRS cluster:
- There is a shared storage between all hosts.
- All VMs are located on volumes that are shared between all hosts.
- All VMs use volume names to specify the location of virtual disks.
- If Raw Device Mapping (RDM) VMFS volumes are being used, they must be in virtual compatibility mode.
- There is a gigabit network connecting all hosts.
- All hosts have compatible processors. Please refer to the...
