Re: Mount order for directories

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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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