Re: Mount order for directories
From: Paul Howarth (paul_at_city-fan.org)
Date: 10/18/04
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Date: Mon, 18 Oct 2004 10:22:32 +0100 To: For users of Fedora Core releases <fedora-list@redhat.com>
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.
Paul.
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