Ignatios Souvatzis <is@netbsd.org> writes:

> > > > of course requests and position in file will be padded to 4 or 8kB
> > >
> > > I don't think this is possible.
> > >
> > > Which reminds me:
> > > are block reads/writes  from/to disk devices cached in the buffer cache?
> > 
> > if r* device is used - no so i can use raw device for that.
> > but this is not very easy to change partitioning every hour ;)
> > 
> > raw file access would be nice.
> 
> Why do you need this at all?

 To make a backup copy of your DB that is placed in such a file instead of
 raw partition, for example. 

Oleg