The installation of a Umsdos is not much different from the installation of an ordinary (Ext2 based) Linux system.
There are two main differences.
The normal steps for an installation are
With Umsdos, the step 1 is not required (wasn't it the goal of Umsdos not to reformat ?).
It is possible to install a Umsdos system just by copying
all packages into
/mnt. This will certainly work. But it
will create a
bunch of subdirectories into your DOS root directory (C:) and
you won't like it. This is the reason all Umsdos installation
use the pseudo-root. And this is the major difference between
a normal Ext2 installation and a Umsdos one: All files
are copied into
/mnt/linux is not an ordinary directory. It has to
be promoted so it will correctly handle Linux long file name
and special files (links, device). The step required to
/mnt/linuxis correctly setup
Even if the setup of
/mnt/linux is pretty simple, there
are many installation package out there who get it wrong. How can ?
The biggest installation problem come from an incompatible
umssync program. Umsdos has been update in
linux 1.1.88 (Can't remember exactly) and a flaw was uncovered
umssync. To avoid confusion in the Linux
community, it was decided to raise the compatibility
level required for all Umsdos tools. Old version
of the tools were simply rejected.
It sounds like many distribution did not update their
umssync utility on the installation disk.
There are still many distribution like this out there. The net result
is that the directory
/mnt/linux is not promoted at all
and will truncate all long file name and will reject all special
It is possible to do a test very early during the installation to find out if something went wrong. Thanks to the pseudo console mechanism of Linux, you can do that without leaving the installation program. Do the following steps:
Altkey at the same time as the
cd /mnt/linuxIf this fail, you are trying this too early. A good time to do this is at the end of the packages selection.
ls -lYou should see an empty file
TOTOin uppercase. If you see it in lowercase, something went wrong. Try to do the
umssynccan be use over and over without problem.
umssync .If there is no error message, try the
TOTOtest again. If
TOTOappears fine, then all is OK. Something is strange in this installation, but you just save it. Continue
Alt-F1to get back to the installation screen.
If the test fail, the best fix is to get a newer installation
root disk. You can generally fix this root disk by installing
a newer version of
umssync. This is not difficult but
required a working Linux system. You simply have to
mount the root disk floppy and replace the offending
umssync with a new one.
Most Umsdos installation which fail, do this by printing this strange message. This is not a bug in Umsdos although the message looks strange. Here are the known causes.
The Slackware installation try to setup a swap file very early during the installation. To do so, it asks you to select a partition (dos drive), then mount it and set the swap file.
When installing a Slackware system, you must setup
the target partition prior to install. This normally
mounts the DOS partition on
/mnt/linux directory and applies
This is where most problems come from. Most user just
forget the "setup target partition" step and go directly
to the rest of the installation. Since
already mounted, this mistake goes unnotice.
This means that
was not created properly (Not promoted). All special files
and links and long names can't be created properly.
/mnt/linux was improperly setup-ed. Generally caused
by an improper
umssync utility on the installation
There was a bug in Umsdos prior to Linux 1.2.2. The
pseudo-root mode would not activate properly if the
/etc/init was missing.
init is now located
/sbin. You can fix it by getting a newer kernel.
This is recommended because another bug was uncover and fixed
If you can't upgrade, do this
mount -t umsdos /dev/hdXX /mntwhere
/dev/hdXXis your DOS partition.
ln -s ../sbin/init init
Unfortunatly, the first two (Installation problems) produce a completly unusable installation. Uninstall it (See next section) and install again.
One neat thing about Umsdos and its pseudo-root
mechanism, is that you can UN-install it without pain. You
just boot DOS and recursively delete the
directory. That's all. Umsdos requires no special
drivers in the config.sys, nor it creates anything
special outside of the
This can be done from Linux or from DOS.
You just have to copy recursively the
from one drive to the other. After that you will have to
adjust you boot mechanism (generally loadlin command) and
Umsdos can live on any DOS drive. There is no
need to install it on the
C: drive, nor it is important
to have it on the first hard drive. It does not matter at
In fact, one may decide to have several Umsdos installations on different drive just to do experiments.
How about installing a bunch of Linux systems in no time ?
Umsdos systems are living in a DOS world. You can take advantage of this if you wish to install Linux easily.
You can install and configure a Umsdos system at your site.
When you are satisfied with the configuration and the different
packages you have selected, you can boot DOS and copy
linux directory to your DOS file
server. Then you go to other DOS station and simply
copy the files on the network drive to the local drive.
That's it. Only adjust the boot script (Loadlinx) and go.
With minimal adjustment (Host name, IP number), anyone will be able to install a Linux system in a matter of minute.
Interest readers may note that installing Linux systems by copying running system also works for any other Linux systems, including Ext2 based one.
One beauty of Linux is that there is no hidden files which have to be install by magic installation program.