Editing Veritas File System (section)

==Version history==
The on-disk layout of VxFS is versioned and upgradeable while the file system is mounted. This file system has gone through ten versions.

* Version 2 added support for filesets, dynamic inode allocation and ACLs. Layouts 1-3 stopped being supported in VxFS 4.0.
* Version 4 added support for storage checkpoints and for [[Veritas Cluster File System]]. Version 4 was released in VxFS 3.2.1. Layout version 4 is no longer supported under VxFS 5.1.<ref name="VxFS-5.1">{{cite web|url=http://seer.entsupport.symantec.com/docs/339064.htm|archive-url=https://web.archive.org/web/20110716174201/http://seer.entsupport.symantec.com/docs/339064.htm|url-status=dead|archive-date=July 16, 2011|title=Veritas File Systems with Disk Layout Version 4 or Version 5 Cannot be Mounted or Upgraded with Veritas File System Release 5.1}}</ref>
* Version 5 started support for file systems up to 32 [[terabyte]]s ({{nowrap|2<sup>45</sup> bytes}}) in size.  Individual files can be up to 2 terabytes in size. Version 5 was introduced in VxFS 3.5 and is no longer supported under VxFS 5.1.<ref name="VxFS-5.1"/>
* Version 6 added support for file systems and files up to 8 [[exabyte]]s ({{nowrap|2<sup>63</sup> bytes}}) in size. Version 6 also introduced support for [[Fork (filesystem)|named streams/resource forks]], for multiple underlying volumes, and for [[File Change Log|file change logs]]. Version 6 was introduced in VxFS 4.0.
* Version 7 extends support for multiple volumes to permit Dynamic Storage Tiering. Dynamic Storage Tiering allows root users to move files among different volumes, allocate files to different volumes at file creation time based on policy, and independently recover volumes, without altering the namespace of the file system. Version 7 was introduced in VxFS 5.0.
* Version 8 enables support for file-level snapshots and shared extents. Version 8 was introduced in VxFS 5.1.
* Version 9 enables support for file compression, deduplication, and partition directories. Version 9 was introduced in VxFS 6.0.
* Version 10 enables support for maxlink, which permits a directory to contain more than 64K subdirectories. Version 10 was introduced in VxFS 6.1.