It has built-in logic for rescan that detects changes in LUNs automatically. The larger the VMFS disk, the lower the percentage of space used for storing metadata. The use of large block sizes keeps VM disk performance close to that of native SCSI disks. VMFS is optimized for storing and accessing large files. This feature allows pooling of storage and flexibility in creating the storage volumes required by VMs. A VMFS volume can be extended over 32 physical storage extents (32 extents per VMFS volume), including SAN volumes and local storage. Beginning from ESX 3 and VMFS3, VM configuration files are stored in the VMFS partition by default. VMFS3 introduces a directory structure in the file system and older versions of ESX Server cannot read or write VMFS3 volumes. VMFS version 3 (VMFS3) is used by ESX Server 3.x and vSphere 4.x. VMFS volumes can be logically expanded (i.e., nondestructively increased in size) by spanning multiple VMFS volumes together. If a physical server fails, the on-disk lock for each VM is released so that VMs can be restarted on other physical servers. VMFS provides on-disk distributed locking to ensure that the same VM is not powered on by multiple servers at the same time. It is a clustered file system that uses shared storage to allow multiple physical servers to read and write to the same storage simultaneously, while individual VM files are locked to prevent conflicts. VMFS stores VM files, which include disk images, snapshots, and so on. Tan, in Private Cloud Computing, 2012 Virtual machine file system
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