Using multiple direct mounts

You can mount multiple remote filesystems to a single local directory with a direct mount configuration. This section compares the two ways in which you can configure direct multiple mounts with an analogous indirect mount.

Figure 13-2, ``An example of indirect mounting using automount'', illustrates an indirect mount where two filesystems, each from a different server, are mounted under a single parent directory. In this indirect mount, each of the remote filesystems is mounted only when that remote filesystem is accessed. Further, if you access one directory, causing it to be mounted, and then try to cd to the other using a relative path, the system will not find or mount the other directory. For example:

cd /doc_tools/spellers
cd ../roff
../roff: No such file or directory

To reach /doc_tools/roff would require:

cd /doc_tools/roff

If you access /doc_tools/roff before executing cd ../roff, with the ls command for example, then /doc_tools/roff gets mounted and you can reach it using a relative path.

Here is an example showing one way in which you could mount the same two remote filesystems under a single parent, but using a direct mount configuration:

   /doc_tools/spellers     -r,soft   madrid:/doc.stuff/spellers
   /doc_tools/roff         -r,soft   oslo:/doc/bin/roff

Here is an example showing a second way in which you can mount the same two remote filesystems under a single parent, but using a single direct configuration.

   /doc_tools \
                  /spellers    -r,soft   madrid:/doc.stuff/spellers \
                  /roff        -r,soft   oslo:/doc/bin/roff

This ``unified mount'' has these advantages over the previous direct mount example:

• Improved system performance through less mount activity and one fewer mount point's being needed.

• Relative path movement without qualifications.

• Improved system performance through less mount activity and one fewer mount point's being needed.

• Relative path movement without qualifications.

• Ability to cd to the parent directory; since the indirect mount creates a virtual parent directory only, you cannot cd to that directory. See ``Unexpected filesystem behavior'' for more information on how the shell's being used affects behavior.

The above examples show remote filesystems residing on different servers. The above examples would still be valid if all remote filesystems were from the same server or there were more than two remote filesystems being mounted and all were from different servers.

If unified direct mounts share the same options, it is not necessary to duplicate these options for each server. Rather, the options can precede the different mounts:

   /doc_tools             -r,soft   \
               /spellers            madrid:/doc.stuff/spellers \
               /roff                oslo:/doc/bin/roff

   /doc_tools             -r,soft   \
               /spellers  -rw       madrid:/doc.stuff/spellers \
               /roff                oslo:/doc/bin/roff

A special case of multiple direct mounts occurs when the root of a filesystem has to be mounted as well.
This is called a ``hierarchical'' mount. A true hierarchical mount might be:

   /usr/local \
           /                   prague:/usr/local \
           /bin    -r,soft     tokyo:/usr/local/bin \
           /src    -r          milan:/usr/local/src

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