performance/space penalties when using large files.

[Rami Ostrovsky_1]

Hello,
Are there performance/space penalties when using large files on HP-UX 11.0
Already checked in HP-UX Large Files White Paper and in ITRC database but can't find the
answer.
The Large files summit at (http://ftp.sas.com/standards/large.file/index.html) - already checked too.

Thanks in advance.

[Patrick Wallek]

There are no performance penalties when using the largefiles option.

One thing to be aware of that the typical unix backup tools like tar and cpio do not know how to deal with files larger than 2GB. As far as I know fbackup is the only native HP-UX utility that can handle large files.

[James R. Ferguson]

Hi:

To my knowledge, there is no performance degradation associated with largefile systems.

The mount options and/or the filesystem's type (largefiles/no largefiles) prevent unintentional operations.

The biggest drawback is perhaps that the old(er) backup utilities like 'tar', 'cpio', 'pax' and 'dump' do not support largefiles (>2GB).

...JRF...

[Bernie Vande Griend]

No penalties, I always make it large file compatible if there is any question if it will be necessary. Just to add what Patrick says, 'dd' is one HP native utility that you could also use here. Besides fbackup, I'd also suggest getting GNU's tar as it works very well with large files.

[A. Clay Stephenson]

Hi,

I've never seen any performance problems associated with largefiles. The only downside as has been mentioned is that many of the standard utilities fail above 2GB. If you are using OmniBack it works just fine.

Clay