Fault Tolerance
Fault Tolerance (FT) is a feature of vSphere HA cluster. Hence to be able to use FT you need to configure an HA cluster first. FT is enabled on those VMs which need a higher level of protection. On enabling FT on the selected VM, a selected VM becomes primary and a new secondary VM is created on one of the hosts in the HA cluster.For being able to configure FT on VMs:
- Configure a VMKernel portgroup enabled for FT Logging on all ESXi hosts which would host FT VMs
- Virtual disks on FT VMs have to be “Thick Provisioned Eager Zeroed”
- ISO/Floppy images have to be stored on Shared Storage
- Hosts in cluster Should meet vMotion requirements, (again I don’t think this is requirement per se but would be very beneficial)
Q. Does FT support vSMP on VMs?
A. No. VMs with vSMP cannot be enabled for FT. i.e. VMs with more than 1 vCPU cannot be protected with FT.
Q. Is FT supported on AMD processors.
A. Yes, both Intel & AMD processors are supported for FT. The VMware’s KB#1008027 article lists what processors and guest operating systems are supported for FT.
Q. How many FT VMs can be hosted on a single ESXi host?
A. Maximum 4 FT VMs supported per ESXi host (either Primaries or Secondaries).
Q. What is a primary VM?
A. Primary VM is a VM which is serving the user requests. The access to this VM is always read-write.
Q. What is a secondary VM?
A. Secondary is a backup VM, which is promoted to primary in case of (original) Primary VM failure. When it is a Secondary VM, the access to this VM is always read-only.
From: http://virtual-drive.in/
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