Re: [SSI] Question about CFS and GFS

[David B. Z. <dz...@ka...>]

Christoph Hellwig wrote:

> To the Compaq folks:  does CFS require hooks in the lowlevel filesystem?
> Otherwise CFS onto of OpenGFS should just work.

We don't need hooks in the lowlevel filesystem.  We do assume that there is a single server node, so stacking on top of OpenGFS
really doesn't come for free if you want more than one node accessing the disk.

>
>
> Talking about CFS architecture, is it a port of the UnixWare CFS?
> I think that kind of layering will not work under Linux, as trees can
> be attached at multiple points in the namespace...  Just my 2 Cents.

We are layering, but we think we have a handle on the multiple mount points issue.  The UnixWare CFS is quite different, so I
would say the we are porting some of the code, and other code is based on Linux NFS/OpenGFS.

>
>
>         Christoph
>
> --
> Of course it doesn't work. We've performed a software upgrade.
>
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--
David B. Zafman                             | Compaq Computer Corporation
Linux Kernel Developer                  | Open SSI Clustering Project
mailto:dav...@co... | http://www.compaq.com
"Thus spake the master programmer:  When you have learned to snatch
the error code from the trap frame, it will be time for you to leave."