VERITAS File System 4.1 Administrator's Guide

Disk Layout
Disk Layout
Appendix C256
The VxFS Version 5 Disk Layout
VxFS disk layout Version 5 is similar to Version 4. Structural files in Version 5 are the same
in Version 4. However, the Version 5 disk layout supports file systems up to 32 terabytes. For
a file system to take advantage of VxFS 32-terabyte support, it must be created on a
VERITAS Volume Manager volume, and only on a 64-bit kernel operating system. The
maximum file system size on a 32-bit kernel is still one terabyte. Files cannot exceed two
terabytes in size. For 64-bit kernels, the maximum size of the file system you can create
depends on the block size:
If you specify the file system size when creating a file system, the block size defaults to the
appropriate value as shown above (see the mkfs(1M) manual page for more information).
The Version 5 disk layout also supports group quotas (See “Quota Files on VxFS” on
page 128). Quota limits cannot exceed one terabyte.
The Version 5 disk layout also supports up to 1024 access control list entries.
The VxFS Version 6 Disk Layout
VxFS disk layout Version 6 is similar to Version 5. Structural files in Version 6 are the same
in Version 5. However, the Version 6 disk layout supports files and file systems up to 8
exabytes (263). For a file system to take advantage of VxFS 8-exabyte support, it must be
created on a VERITAS Volume Manager volume, and only on a 64-bit kernel operating
system. The maximum file system size on a 32-bit kernel is still one terabyte. For 64-bit
kernels, the maximum size of the file system you can create depends on the block size:
Table C-2
Block Size Maximum File System Size
1024 bytes 4,294,967,039 sectors (~ 4 TB)
2048 bytes 8,589,934,078 sectors (~ 8 TB)
4096 bytes 17,179,868,156 sectors (~ 16 TB)
8192 bytes 34,359,736,312 sectors (~ 32 TB)
Table C-3
Block Size Maximum File System Size
1024 bytes 4,294,967,039 sectors (~ 4 TB)
2048 bytes 8,589,934,078 sectors (~ 8 TB)