Subject: Re: JFS
To: Pavel Cahyna <>
From: Bill Studenmund <>
List: tech-kern
Date: 02/24/2003 15:02:31
On Mon, 24 Feb 2003, Pavel Cahyna wrote:

> > be the best way to get XFS in the kernel. Note though that XFS also places
> > requirements on the bottem-half of the file system, the buffer/vm system
> > interface. It does this so that it can maintain commitments of
> > isosynchronous (is that the right word?) transfers. So main-tree code
> I believe that the realtime behaviour or Guaranteed Rate I/O
> (are you speaking about this?)

I think so. ;-)

> is an option which you may or may not have. If you want it, you must enable
> it at the filesystem's creation date (a so-called realtime subvolume
> must be added, which AFAIK should reside on a separate disk) and I
> believe you also must purchase it separately (not sure about this). Linux's
> XFS doesn't even have this option. So XFS could (theoretically) be
> ported without it.

Ahh, ok.


Take care,