topic Re: JFS largefiles in Operating System - HP-UX

JFS largefiles

Ian Killer — Tue, 23 Jan 2001 11:01:21 GMT

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

How much does it impact performance?

Re: JFS largefiles

Darrel Louis — Tue, 23 Jan 2001 14:02:22 GMT

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

Re: JFS largefiles

Darren Miller — Wed, 24 Jan 2001 15:41:47 GMT

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.

Re: JFS largefiles

Patrick Wallek — Wed, 24 Jan 2001 15:59:37 GMT

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.