Mount order for directories

[Nick Pierpoint]

On Mon, 2004-10-18 at 10:22, Paul Howarth wrote:
> Nick Pierpoint wrote:
> > Hello all.
> > 
> > If I have a disk mounted on /opt:
> > 
> > 	mount /dev/hdb1 /opt
> > 
> > but then also have another disk mounted on /opt/thensome
> > 
> > 	mount /dev/hdb2 /opt/thensome
> > 
> > In /etc/fstab I'd have something like:
> > 
> > 	LABEL=/opt          /opt           ext3 defaults 1 2
> > 	LABEL=/opt/thensome /opt/thensome  ext3 defaults 1 2
> > 
> > My question is will this always work? When directory mounts have a
> > degree of inter-dependence how do you specify the mount order? Does the
> > mount process religiously follow through the order in fstab?
> 
> "man 8 mount" suggests that mount does choose the correct order to use, 
> because if you look at the -F option to fork a separate mount process for each 
> filesystem, it says "This will do the mounts on different devices or different 
>   NFS servers in parallel. This has the advantage that it is faster; also NFS 
> timeouts go in parallel. A disadvantage is that the mounts are done in 
> undefined order. Thus, you cannot use this option if you want to mount both 
> /usr and /usr/spool." The implication is therefore that if you don't use the 
> -F option, mount will get the order right.

It was the man page that led to my question really - I wondered what
happened at boot time. Are they mounted in parallel or in series?

--
nick