Frank Denneman from frankdenneman.nl writes:

Fault tolerant write acceleration is one of the key features of FVP. Once you select a virtual machine to be accelerated by FVP you can choose to apply a write through policy or write back policy with a x number of replicas of the virtual machine. Before expanding upon replicas, let’s review the basics of write through and write back policies.

Read more at: Write-Back and Write-Through policies in FVP