What are the best practices for storage configuration if I want to use VMotion?
In order to use VMotion, your Virtual Machines must be stored entirely on a public VMFS volume. This includes the boot disk and all of the virtual machines’ swap files. The public VMFS volume must be accessible by both the source and target ESX Servers in order to VMotion the virtual machines between the two servers. Best practice guidelines suggest connecting up to 5-10 ESX Servers to a single, public VMFS volume. Dividing up virtual machines across multiple VMFS volumes will also improve performance and scalability. Each of these volumes may still be accessible across the same set of ESX Servers.