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Advanced Server/9000 Version B.03.06.10/B.04.06.10 Release Notes > Chapter 6 Operational Notes

HP-UX Large File Support

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AS/U has been enhanced to support HP-UX large file capabilities. Clients that can handle file sizes larger than 4 gigabytes (GB) can now use AS/U servers to store and access very large database or backup files.

Clients such as MS WIN95 and WFW/DOS which do not support files larger than 4 GB must be used carefully when accessing files larger than 4G. Please note the following issues with Win95 and WFW/DOS clients and files > 4G :

  • File sizes will not be displayed correctly.

  • Read operations are possible, but only up to the first 4 GB.

  • Append operations will not operate properly and may instead truncate the file causing data loss.

  • Record locking is only possible within the first 2 GB.

Note also, that some DOS commands on NT only support files up to 4 GB. For example, BACKUP can not back up a file which is greater than 4 GB.

Directory replication with files larger than 4G is not recommended.

AS/U Registry Considerations

The MaxFileSizeInKB parameter in the AS/U registry places an upper limit on the size of files that can be created from a client. The default value in previous releases was 20000KB. If clients wish to create files larger than the default, the System Administrator must change MaxFileSizeInKB using regedit on a NT client or regconfig on the HP-UX command line. AS/U must then be restarted to make the changes effective.

With AS/U release B.0x.04 and later, the default value was increased from 20000KB to 200000K.

For more detailed information, refer to "File Service Parameters Entries" section in Appendix A of the Advanced Server/9000 Administrator's Guide.

Note, the similar sounding parameter MaxFileSize in the lanman.ini file does not affect the maximum file size.

Enabling Large File Support on HP-UX

In order to create large files (> 4G) on HP-UX system, a HFS file system must be enabled to contain large files. That can be accomplished by the following steps:

  1. Unmount the volume.

    /usr/sbin/umount <path name>

    ex: /usr/sbin/umount /newdisk

  2. Configure it to contain large files.

    fsadm -F hfs -o largefiles <volume name>

    ex: fsadm -F hfs -o largefiles /dev/vg00/lvol1

  3. Mount it back to be able to create large files.

    /usr/sbin/mount -F hfs -o largefiles <volume name> <path name>

    ex: /usr/sbin/mount -F hfs -o largefiles /dev/vg00/lvol1 /newdisk

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