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VMware VMFS (Virtual Machine File System) is VMware, Inc.'s clustered file system used by the company's flagship server virtualization suite, vSphere. It was developed to store virtual machine disk images, including snapshots. Multiple servers can read/write the same filesystem simultaneously while individual virtual machine files are locked. VMFS volumes can be logically "grown" (non-destructively increased in size) by spanning multiple VMFS volumes together. It is not mandatory to use VMFS with VMware; an alternative is NFS. == Version history == There are four versions of VMFS, corresponding with ESX Server product releases. * VMFS1 was used by ESX Server v1.x. It did not feature the cluster filesystem properties and was used only by a single server at a time. VMFS1 is a flat filesystem with no directory structure. * VMFS2 is used by ESX Server v2.x and (in a limited capacity) v3.x. VMFS2 is a flat filesystem with no directory structure. * VMFS3 is used by ESX Server v3.x and vSphere 4.x. Notably, it introduces directory structure in the filesystem. * VMFS5 is used by vSphere 5.x. Notably, it raises the extent limit to 64 TB and the file size limit to 62 TB,〔 though vSphere versions earlier than 5.5 are limited to VMDKs smaller than 2 TB.〔(【引用サイトリンク】format=PDF )〕 * VMFS-L is the underlying file system for VSAN-1.0. Leaf level VSAN objects reside directly on VMFS-L volumes that are composed from server side direct attached storage (DAS). File system format is optimized for DAS. Optimization include aggressive caching with for the DAS use case, a stripped lock down lock manger and faster formats. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「VMware VMFS」の詳細全文を読む スポンサード リンク
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