what 's the difference of file system that support single file large than 2GB,and common file syste

[常有慈悲心]

when use:mount -o largefiles,it can support a file that large than 2GB,
what did the system do?
thank you ,every one.

[Robert-Jan Goossens]

Hi,

Check this document on your HPux system.

# more /usr/share/doc/lg_files.txt

Best regards,
Robert-Jan

[Geoff Wild]

The filesystem has to be made large file system aware prior to mounting with largefiles.

From mkfs_vxfs man page:

largefiles|nolargefiles
Valid only for the Version 3 and 4 disk
layouts. Controls the largefiles flag for
the file system. If largefiles is specified,
the bit is set and files two gigabytes or
larger can be created. If nolargefiles is
specified, the bit is cleared and files
created on the file system are limited to
less than two gigabytes. The default is
nolargefiles. See fsadm_vxfs(1M).

NOTE: Large files are supported on HP-UX
10.20 systems and above. Be careful when
implementing large file system capability.
System administration utilities such as
backup may not operate correctly if they are not large-file aware.

Rgds...Geoff