VCAP-DCA Objective 4.2 : Deploy + Test VMware FT
August 18, 2010 
Sean Crookston 
This is a fairly quick objective to run through. I recommend giving Eric Siebert’s blog article a good read if you are not familiar with the requirements and concepts behind fault tolerance. Additionally Vladan Seget has a great blog on troubleshooting FT.
Knowledge
Identify VMware FT hardware requirements
Requires a Fault Tolerance capable processor and both hosts but have the same processor family. While the speeds don’t have to match remember that FT relies on close synchronization so the closer they are the better.
Identify VMware FT compatibility requirements
Same Build number for ESX(i) hosts
Gigabit NIC’s
Common Shared Storage
Single Proc machine
Thin Provisioned disks not supported(automatically converted)
No snapshots
Skills and Abilities
Modify VM and ESX/ESXi Host settings to allow for FT compatibility
Use VMware best practices to prepare a vSphere environment for FT
Use the VMware Site Survey utility to check configuration compatibility with advanced features such as Fault Tolerance.
Configure FT logging
Check the bock on the virtual nic for “Use this virtual adapter for Fault Tolerance logging”
Separate NIC for FT Logging and vMotion recommended.
Prepare the infrastructure for FT compliance
On the Summary page of each host you will see the status of Fault Tolerance and can view the requirements you will need to take action on there.
Test FT failover, secondary restart and application fault tolerance in a FT Virtual Machine
Tools
vSphere Availability Guide
Product Documentation
vSphere Client
Other relevant blogs and websites related to this section
http://www.vmware.com/files/pdf/resources/ft_virtualization_wp.pdf
http://www.vladan.fr/troubleshooting-fault-tolerance-in-vsphere/
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I dont know how much it will help in the test but there is a tool from VMware that checks fault tolerance capability. It adds a tab in Vcenter and runs a report to give you a detailed status of what is incompatible with Fault Tolerance I thought it is worth mentionig http://www.vmware.com/download/shared_utilities.html