6.7
Table Of Contents
- vSphere Resource Management
- Contents
- About vSphere Resource Management
- Getting Started with Resource Management
- Configuring Resource Allocation Settings
- CPU Virtualization Basics
- Administering CPU Resources
- Memory Virtualization Basics
- Administering Memory Resources
- Persistent Memory
- Configuring Virtual Graphics
- Managing Storage I/O Resources
- Managing Resource Pools
- Creating a DRS Cluster
- Using DRS Clusters to Manage Resources
- Creating a Datastore Cluster
- Initial Placement and Ongoing Balancing
- Storage Migration Recommendations
- Create a Datastore Cluster
- Enable and Disable Storage DRS
- Set the Automation Level for Datastore Clusters
- Setting the Aggressiveness Level for Storage DRS
- Datastore Cluster Requirements
- Adding and Removing Datastores from a Datastore Cluster
- Using Datastore Clusters to Manage Storage Resources
- Using NUMA Systems with ESXi
- Advanced Attributes
- Fault Definitions
- Virtual Machine is Pinned
- Virtual Machine not Compatible with any Host
- VM/VM DRS Rule Violated when Moving to another Host
- Host Incompatible with Virtual Machine
- Host Has Virtual Machine That Violates VM/VM DRS Rules
- Host has Insufficient Capacity for Virtual Machine
- Host in Incorrect State
- Host Has Insufficient Number of Physical CPUs for Virtual Machine
- Host has Insufficient Capacity for Each Virtual Machine CPU
- The Virtual Machine Is in vMotion
- No Active Host in Cluster
- Insufficient Resources
- Insufficient Resources to Satisfy Configured Failover Level for HA
- No Compatible Hard Affinity Host
- No Compatible Soft Affinity Host
- Soft Rule Violation Correction Disallowed
- Soft Rule Violation Correction Impact
- DRS Troubleshooting Information
- Cluster Problems
- Load Imbalance on Cluster
- Cluster is Yellow
- Cluster is Red Because of Inconsistent Resource Pool
- Cluster Is Red Because Failover Capacity Is Violated
- No Hosts are Powered Off When Total Cluster Load is Low
- Hosts Are Powered-off When Total Cluster Load Is High
- DRS Seldom or Never Performs vMotion Migrations
- Host Problems
- DRS Recommends Host Be Powered on to Increase Capacity When Total Cluster Load Is Low
- Total Cluster Load Is High
- Total Cluster Load Is Low
- DRS Does Not Evacuate a Host Requested to Enter Maintenance or Standby Mode
- DRS Does Not Move Any Virtual Machines onto a Host
- DRS Does Not Move Any Virtual Machines from a Host
- Virtual Machine Problems
- Cluster Problems
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One of the 4GHz hosts becomes unavailable, so total resources reduce to 8GHz.
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At the same time, VM4 (1GHz) and VM3 (3GHz), which were running on the host that failed, are no
longer running.
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The cluster is now running virtual machines that require a total of 6GHz. The cluster still has 8GHz
available, which is sufficient to meet virtual machine requirements.
The resource pool reservations of 12GHz can no longer be met, so the cluster is marked as yellow.
Invalid DRS Clusters
A cluster enabled for DRS becomes invalid (red) when the tree is no longer internally consistent, that is,
resource constraints are not observed.
The total amount of resources in the cluster does not affect whether the cluster is red. A cluster can be
red, even if enough resources exist at the root level, if there is an inconsistency at a child level.
You can resolve a red DRS cluster problem either by powering off one or more virtual machines, moving
virtual machines to parts of the tree that have sufficient resources, or editing the resource pool settings in
the red part. Adding resources typically helps only when you are in the yellow state.
A cluster can also turn red if you reconfigure a resource pool while a virtual machine is failing over. A
virtual machine that is failing over is disconnected and does not count toward the reservation used by the
parent resource pool. You might reduce the reservation of the parent resource pool before the failover
completes. After the failover is complete, the virtual machine resources are again charged to the parent
resource pool. If the pool’s usage becomes larger than the new reservation, the cluster turns red.
If a user is able to start a virtual machine (in an unsupported way) with a reservation of 3GHz under
resource pool 2, the cluster would become red, as shown in the following figure.
vSphere Resource Management
VMware, Inc. 90