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
Turn On Fault Tolerance
You can turn on vSphere Fault Tolerance through the vSphere Web Client.
When Fault Tolerance is turned on, vCenter Server resets the virtual machine's memory limit and sets the
memory reservation to the memory size of the virtual machine. While Fault Tolerance remains turned on,
you cannot change the memory reservation, size, limit, number of vCPUs, or shares. You also cannot add or
remove disks for the VM. When Fault Tolerance is turned o, any parameters that were changed are not
reverted to their original values.
Connect vSphere Web Client to vCenter Server using an account with cluster administrator permissions.
Prerequisites
The option to turn on Fault Tolerance is unavailable (dimmed) if any of these conditions apply:
n
The virtual machine resides on a host that does not have a license for the feature.
n
The virtual machine resides on a host that is in maintenance mode or standby mode.
n
The virtual machine is disconnected or orphaned (its .vmx le cannot be accessed).
n
The user does not have permission to turn the feature on.
Procedure
1 In the vSphere Web Client, browse to the virtual machine for which you want to turn on Fault
Tolerance.
2 Right-click the virtual machine and select Fault Tolerance > Turn On Fault Tolerance.
3 Click Yes.
4 Select a datastore on which to place the Secondary VM conguration les. Then click Next.
5 Select a host on which to place the Secondary VM. Then click Next.
6 Review your selections and then click Finish.
The specied virtual machine is designated as a Primary VM, and a Secondary VM is established on another
host. The Primary VM is now fault tolerant.
Turn Off Fault Tolerance
Turning o vSphere Fault Tolerance deletes the secondary virtual machine, its conguration, and all history.
Use the Turn Fault Tolerance option if you do not plan to reenable the feature. Otherwise, use the
Suspend Fault Tolerance option.
N If the Secondary VM resides on a host that is in maintenance mode, disconnected, or not responding,
you cannot use the Turn Fault Tolerance option. In this case, you should suspend and resume Fault
Tolerance instead.
Procedure
1 In the vSphere Web Client, browse to the virtual machine for which you want to turn o Fault
Tolerance.
2 Right-click the virtual machine and select Fault Tolerance > Turn Fault Tolerance.
3 Click Yes.
Chapter 3 Providing Fault Tolerance for Virtual Machines
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