The disk layout is the way file system information is stored on disk. On VxFS, several different disk layout versions were created to take advantage of evolving technological developments.
The disk layout versions used on VxFS are:
Some of the disk layout versions were not supported on all UNIX operating systems. Currently, only the Version 7, 8, and 9 disk layouts can be created and mounted. The Version 6 disk layout can be mounted, but only for upgrading to a supported version. Disk layout Version 6 cannot be cluster mounted. To cluster mount such a file system, you must first mount the file system on one node and then upgrade to a supported disk layout version using the vxupgrade command. No other versions can be created or mounted. Version 9 is the default disk layout version.
The vxupgrade command is provided to upgrade an existing VxFS file system to the Version 7 layout while the file system remains online.