Subject: Re: MFS over ISO-9660 union mounted with no swap space?
To: Ignatios Souvatzis <>
From: Todd Vierling <>
List: tech-kern
Date: 05/12/1999 11:36:41
On Wed, 12 May 1999, Ignatios Souvatzis wrote:

: > Note that there's a key difference between unionfs and the MOUNT_UNION
: > option: `mount -o union' only unions the top-level mounted-on
: > directory, while `mount -t union' unions stuff further down in the
: > tree..
: Directory tree or mount tree?

"mount -o union" acts in a way that does no "copyup" action.  Directories in
the upper layer receive files and new directories created inside them;
directories only in the lower layer receive files and directories created
inside those.

At least, this is my perception of the -o union option.  :)

-- Todd Vierling (Personal; Bus.