JFS largefiles

[Ian Killer]

Why would I not want use the largefiles option when creating/mounting a JFS filesystem?

How much does it impact performance?

[Darrel Louis]

Hi,

On your system there is a nice documents, which may answer all your questions.
/usr/share/doc/lg_files.txt.
or
http://www.docs.hp.com/hpux/onlinedocs/os/lgfiles4.pdf

Have Fun

Darrel

[Darren Miller · Accepted solution]

I believe that enabling Large Files is fairly harmless. The only issue I'm aware of is interoperability. If you attempt to access a "large file" via NFSv2, or using a command (like vi, for instance) that doesn't support large files, you may run into problems. If you create the file system with "-o largefiles", but then never actually create a large file, no harm is done.

[Patrick Wallek]

Whether or not you enable large files support depends on the size that your lvol is going to be. If you are creating a logical volume that is 1500 MB, then there is no point in turning on largefile support.

If you wind up extending the lvol beyond 2 GB, then you can always go back and turn on largefile support with fsadm.