VMFS5 provides many improvements in scalability and performance over the previous version.

VMFS5 has the following improvements:

Support of greater than 2TB storage devices for each VMFS extent.

Increased resource limits such as file descriptors.

Standard 1MB file system block size with support of 2TB virtual disks.

Support of greater than 2TB disk size for RDMs in physical compatibility mode.

Scalability improvements on storage devices that support hardware acceleration. For information, see Storage Hardware Acceleration.

Default use of hardware assisted locking, also called atomic test and set (ATS) locking, on storage devices that support hardware acceleration. For information about how to turn off ATS locking, see Turn off ATS Locking.

Ability to reclaim physical storage space on thin provisioned storage devices. For information, see Array Thin Provisioning and VMFS Datastores.

Online in-place upgrade process that upgrades existing datastores without disrupting hosts or virtual machines that are currently running.