6.5.1
Table Of Contents
- vSphere Availability
- Contents
- About vSphere Availability
- Business Continuity and Minimizing Downtime
- Creating and Using vSphere HA Clusters
- Providing Fault Tolerance for Virtual Machines
- vCenter High Availability
- Plan the vCenter HA Deployment
- Configure the Network
- Configure vCenter HA With the Basic Option
- Configure vCenter HA With the Advanced Option
- Manage the vCenter HA Configuration
- Set Up SNMP Traps
- Set Up Your Environment to Use Custom Certificates
- Manage vCenter HA SSH Keys
- Initiate a vCenter HA Failover
- Edit the vCenter HA Cluster Configuration
- Perform Backup and Restore Operations
- Remove a vCenter HA Configuration
- Reboot All vCenter HA Nodes
- Change the Appliance Environment
- Collecting Support Bundles for a vCenter HA Node
- Troubleshoot Your vCenter HA Environment
- Patching a vCenter High Availability Environment
- Using Microsoft Clustering Service for vCenter Server on Windows High Availability
- Index
Validation Checks for Turning On Fault Tolerance
If the option to turn on Fault Tolerance is available, this task still must be validated and can fail if certain
requirements are not met.
Several validation checks are performed on a virtual machine before Fault Tolerance can be turned on.
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SSL certicate checking must be enabled in the vCenter Server seings.
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The host must be in a vSphere HA cluster or a mixed vSphere HA and DRS cluster.
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The host must have ESXi 6.x or greater installed (ESX/ESXi 4.x or greater for legacy FT).
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The virtual machine must not have snapshots.
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The virtual machine must not be a template.
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The virtual machine must not have vSphere HA disabled.
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The virtual machine must not have a video device with 3D enabled.
Checks for Powered-On Virtual Machines
Several additional validation checks are performed for powered-on virtual machines (or those that are in the
process of being powered on).
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The BIOS of the hosts where the fault tolerant virtual machines reside must have Hardware
Virtualization (HV) enabled.
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The host that supports the Primary VM must have a processor that supports Fault Tolerance.
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Your hardware should be certied as compatible with Fault Tolerance. To conrm that it is, use the
VMware Compatibility Guide at hp://www.vmware.com/resources/compatibility/search.php and
select Search by Fault Tolerant Compatible Sets.
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The conguration of the virtual machine must be valid for use with Fault Tolerance (for example, it
must not contain any unsupported devices).
Secondary VM Placement
When your eort to turn on Fault Tolerance for a virtual machine passes the validation checks, the
Secondary VM is created. The placement and immediate status of the Secondary VM depends upon whether
the Primary VM was powered-on or powered-o when you turned on Fault Tolerance.
If the Primary VM is powered on:
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The entire state of the Primary VM is copied and the Secondary VM is created, placed on a separate
compatible host, and powered on if it passes admission control.
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The Fault Tolerance Status displayed for the virtual machine is Protected.
If the Primary VM is powered o:
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The Secondary VM is immediately created and registered to a host in the cluster (it might be re-
registered to a more appropriate host when it is powered on.)
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The Secondary VM is not powered on until after the Primary VM is powered on.
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The Fault Tolerance Status displayed for the virtual machine is Not Protected, VM not Running.
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When you aempt to power on the Primary VM after Fault Tolerance has been turned on, the additional
validation checks listed above are performed.
After these checks are passed, the Primary and Secondary VMs are powered on and placed on separate,
compatible hosts. The virtual machine's Fault Tolerance Status is tagged as Protected.
vSphere Availability
48 VMware, Inc.