About disk layouts


About disk layouts
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The disk layout is the way file system information is stored on disk. On VxFS, seven different disk layout versions were created to take advantage of evolving technological developments.

The disk layout versions used on VxFS are:

Version 1	Version 1 disk layout is the original VxFS disk layout provided with pre-2.0 versions of VxFS.	Not Supported
Version 2	Version 2 disk layout supports features such as filesets, dynamic inode allocation, and enhanced security. The Version 2 layout is available with and without quotas support.	Not Supported
Version 3	Version 3 disk layout encompasses all file system structural information in files, rather than at fixed locations on disk, allowing for greater scalability. Version 3 supports files and file systems up to one terabyte in size.	Not Supported
Version 4	Version 4 disk layout encompasses all file system structural information in files, rather than at fixed locations on disk, allowing for greater scalability. Version 4 supports files and file systems up to one terabyte in size.	Not Supported
Version 5	Version 5 enables the creation of file system sizes up to 32 terabytes. File sizes can be a maximum of 4 billion file system blocks. File systems larger than 1TB must be created on a Veritas Volume Manager volume.	Not Supported
Version 6	Version 6 disk layout enables features such as multi-volume support, cross-platform data sharing, named data streams, and File Change Log.	Supported
Version 7	Version 7 disk layout enables support for variable and large size history log records, more than 2048 volumes, large directory hash, and Dynamic Storage Tiering.	Supported

Some of the disk layout versions were not supported on all UNIX operating systems. Currently, only the Version 6 and 7 disk layouts are supported and can be created and mounted. Version 1, 2, 3, 4, and 5 disk layout file systems cannot be created nor mounted. Version 7 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.

See the vxupgrade(1M) manual page.