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Is there a way to make the mount point unwritable? I can't write a script or anything to check, but thought there might be a way to do this via permissions. On Linux you could make it immutable. The problem is that a backup process is filling up the root file system when the mount point fails.

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Why can't you write a script to make the check? Many backup tools allow you to run pre/post backup scripts that can perform this sort of check (and abort the backup if necessary). – larsks Sep 6 '12 at 0:31
Its an application level backup unfortunatly. The functionality baked in and cannot be modified. – user134842 Sep 6 '12 at 3:46

Does AIX let you mount a filesystem over an existing filesystem? Under Linux, you could do something like this:

# mount -t tmpfs -o ro none /mnt/fs

So now /mnt/fs is a read-only filesystem:

# touch /mnt/fs
touch: cannot touch `/mnt/fs/foo': Read-only file system

But you can mount something over it like this:

# mount /dev/myvg/mylv /mnt/fs

And that filesystem is writable:

# touch /mnt/fs/foo
# ls /mnt/fs

If the second mount fails, you're still left with a read-only filesystem. If AIX supports this sort of overlapping mount this might do what you want.

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