Mounted volume, different permissions

From: ohaya (ohaya_at_cox.net)
Date: 11/25/04 

Date: Wed, 24 Nov 2004 22:22:19 -0500

Hi,

I was working on installing Oracle onto a Solaris 9 system today, and
ran into a very strange (to me) problem.

What happened was that we originally had created a directory called
"apps" under "/" on the hard drive and installed some of the Oracle
software. Then, we decided that the "/" filesystem was too small for
some other stuff we were going to be installing, so we uninstalled the
Oracle software, and, using Veritas Volume manager, we created a 30GB
volume.

We then mounted the Veritas volume to "/apps", and proceeded to try to
re-install the Oracle software, but we ran into problems. I struggled
with this for awhile, then found that I was getting a "getcwd:
permission denied" during the installation, but everything looked ok
permission-wise when I checked using "ls -al / |grep apps".

This happened even when I chmod'ed /apps and all the directories under
that to 777 (I got desparate :)).

I kind of puzzled over this for awhile, and did some searching, and
found some posts indicating that 'sometimes', the permissions of the
mount point can cause problems.

I eventually ended up unmounting the Veritas volume, chmod'ed the
"/apps" directory, then re-mounted the Veritas volume. After that, I
tried the Oracle installation, and everything went fine.

I guess that I'm happy that I was able to get around this problem (many,
many hours), but I still am wondering about what exactly the problem
was.

I'm worried that I don't understand the problem exactly, and that it may
come up again later.

Can someone here explain this?

What exactly is going on between the permissions of the underlying mount
point vs. the permissions after the Veritas volume was mounted, i.e.,
what are the "rules"?

For example, should we always chmod the mount point to the desired
permissions before mounting a Veritas volume?

Thanks,
Jim

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