This section provides information for defining the number of disks devices on VMware ESX Server.
The maximum number of devices that are supported on a VMware ESX Server is 128. However the VMkernel supports up to 64 concurrent I/Os. The embedded multipathing capability of the VMkernel can manage up to 1024 disks.
The maximum number of LUNs that can be used must accommodate the 3 previous limitations.