Re: File systems are semantically impoverished compared to database

Horst von Brand (vonbrand@inf.utfsm.cl)
Fri, 25 Jun 1999 13:22:55 -0400

"Albert D. Cahalan" <acahalan@cs.uml.edu> said:
> Theodore Y. Ts'o writes:
> >> From: "Albert D. Cahalan" <acahalan@cs.uml.edu>
> >> No, not like that at all. Structured storage adds an extra allocation
> >> and namespace layer above the filesystem. This works in userspace,
> >> but the performance is poor.

> > I'm not convinced this has to be the case (that performance will be
> > poor).

> For now, every app with this problem has to implement something like
> a growable (and hopefully shrinkable) filesystem within a file.
> Apps can add a block mapping layer complete with triple-indirect
> blocks, or they can copy around huge amounts of data and update
> document references as needed.

Come on, that is done in RAM, not on disk.

-- 
Dr. Horst H. von Brand                       mailto:vonbrand@inf.utfsm.cl
Departamento de Informatica                     Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria              +56 32 654239
Casilla 110-V, Valparaiso, Chile                Fax:  +56 32 797513


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