UNIVERSITY OF MASSACHUSETTS
Department of Electrical and Computer Engineering
ECE 655: Fault Tolerant Computing
1.Where can I get the Möbius software?
ftp to euler.ecs.umass.edu
Change directory to Mobius_backup, i.e., ftp> cd Mobius_backup
Download INSTALL.TXT or INSTALL.html, i.e., ftp>bin;
ftp> get INSTALL.TXT
For Windows 98/Me/NT/2000/XP (or Solaris 2.7, RedHat Linux 6.2)
Follow the instructions in INSTALL.TXT or INSTALL.html, e.g.,
untar the uncompressed file using 'tar -xvf' on Unix, or 'winzip' on
There is no manual for Mobius, but the previous version software,
USAN, has a manual. You can download the Manual file from
~/Manual/manual.pdf or ~/Manual/manual.ps by
ftp to euler.ecs.umass.edu
Change directory to Manual, i.e., ftp> cd Manual
The procedure to run the software:
- Create a project
- Create one or several Atomics by using SAN Model
(Atomic and submodel in Mobius is same as subnet in USAN)
- Connect subnets to form a complete project
- Define Performance variables
- Create studies and experiments
- Solve the model
* Select the study and experiments
* Choose suitable solver
@ Steady state solver or @ Transient Solver
Duplex System: Two processors break down at rates l1, l2 and are
repaired at rates m1, m2. The system is up when both processors work
2. Frequently asked questions:
Q1. I have been trying to install Mobius, but whenever the java
installation script asks me for the MinGW directory, I provide it with
the directory (in my case "C:\MinGW") and the programs gives me the
following error "Please enter a new location for MinGW".
A1. The Mobius installer seems to be checking the version of MinGW &
Cygwin. If you use MinGW & Cygwin from mobius-utils-windows.tar or
mobius-utils-unix.tar, this error message will disappear.
Q2. HW3 requires using Mobius and plotting results but I can't see how
to plot anything.
A2. USAN supported plotting function by using GNUPlot, but Mobius
doesn't support plotting. You have to use other plotting software such
as Microsoft Excel or GNUPlot.
Q3. I'm trying to download the Mobius software from euler.ecs.umass.edu
using anonymous login. However, the connection to ftp site is getting
A3. The server, euler.ecs.umass.edu, doesn't support anonymous ftp.
Please use the predefined username and password. If you don't know them
send a mail to firstname.lastname@example.org.
Q4. The FTP server allows me to login using the ID/Password, but it
gives me timeouts whenever I try to download or even
try to view directory listings.
A4. Please use "sftp" instead of "ftp". If you are out of UMASS network,
you should have to use "sftp". This may can solve your problem.
Q5. I am using the Windows version of Mobius. The software version is:
1.2.1. I installed the latest cygwin and mgwin from respective web
sites. But this combination results in some compile errors, is it ok?
A5. Please, use cygwin & Mgwin from mobius-util-windows.tar. When I
tested Mobius, there was some kind of version problem. If you use other
version of cygwin & Mgwin, I can't guarantee the functionality of
Mobius. Please, donwload mobius-util-window.tar from
sftp://euler.ecs.umass.edu (userid ece655, obtain password from the