Computers

The users have access to a set of University maintained computers and printers named andrew computers/printers, and to private computers administrated by the Math Sciences Dept.

Andrew computers

Andrew computing environment maintained by CMU Computing Services offer:

• the andrew login ID,
• andrew email (IMAP/smtp and webmail) via webmail.andrew.cmu.edu,
• university licensed software downloads via http://www.cmu.edu/myandrew/,
• network registration of private and lab computers via http://netreg.net.cmu.edu/,
• and a set of other facilities (e.g. spam filtering, web authoring, licensing).

For support of andrew services, please contact the CS support group at phone 8-HELP or e-mail it-help@cmu.edu.

Each CMU user gets an andrew account and a 20Mb disk quota to store files and another 20Mb quota for e-mail messages.

The andrew computers in the Math Dept are Intel platforms running Linux. The operating system is Unix-like, but heavily modified to support the andrew characteristics. The andrew computers are configured with user-friendliness and easy access in mind.

In the public clusters one may find Windows XP based andrew workstations.

Qwe or math private computers

Departmental computing environment consists in a set of clusters, desktops, and printers maintained by the department. Departmental support can be obtained by sending email to help@math.cmu.edu or go to room 6108. To use most of the departmental facilities, an account can be obtained upon request from room 6108. The most important components of the departmental computing facilities are:

a) the cluster in room 6120; the computers in this cluster, named qwe1-qwe9.math.cmu.edu, offer easy access to:

• most scientific and office applications,
• printing and scanning,
• a departmental email address username@math.cmu.edu which can be filtered and managed locally by the user,
• a personal website http://www.math.cmu.edu/~username/ showing the files in the public directory on the cluster.

b) a separate cluster containing the nodes fp80-fp87.math.cmu.edu that can be used for parallel programming and running scientific simulations; the access to the parallel cluster is made via ssh using the departmental account.

c) b/w and color printing to the printers in the cluster room (code, heavycolor) and lounges at 7-th (jet7) and 8-th floors (jet8); every printer is labeled with the printing queues and its network configuration; typically a printer is associated with three queues for printing single sided or duplex; these printers can be used as well from the office computers.

d) computing education classes; every spring semester you're invited to attend "21-765. Introduction to Parallel Computing and Scientific Computation".

Office and lab computers are typically serviced by the departmental support group as well; in certain cases these computers use a private set of accounts, local to the group owning the computer; the access to these computers and printers is restricted.

Where can you find a Windows computer?

There are several Windows public computers in the Dept: two in Wean Hall 6403b, the other one in PPBLDG 413. Also there are public clusters of andrew Windows computers around the campus. Please contact the Help Desk for their exact location.

Where can you find a Macintosh computer?

There is at least one Macintosh public computer in the Dept: in Wean Hall 6403b. Also there may be public clusters of Macintosh computers around the campus. Please contact the Help Desk for their exact location.

A list of andrew computers

Unix computers maintained by CMU Computing Services (genericly known as unix.andrew.cmu.edu):
unix1.andrew.cmu.edu
unix2.andrew.cmu.edu
unix3.andrew.cmu.edu
etc.

Andrew Linux computers maintained by the Math Dept (genericly known as anlin.math.cmu.edu):
anlin801.math.cmu.edu
anlin802.math.cmu.edu
anlin803.math.cmu.edu
etc.

Most of these computers (except anlin.math.cmu.edu) are in public clusters or public places. So they can be down or rebooted or misconfigured at any time. If one does not work for you, try another. Recommended: anlin.math.cmu.edu.

SSH/SCP to andrew computers do not seem to work well

SSH/SCP applications are based on keys of individual computers to realize the encryption. Doing ssh or scp to andrew.cmu.edu or unix.andrew.cmu.edu (that are not individual computers, but generic name for a pool of computers) will use one computer in the pool (say unix3.andrew.cmu.edu) for the connection. Next time ssh is used to the same andrew.cmu.edu, the connection is done to another computer in the pool having another key. So ssh/scp complains about a possible problem and sometimes aborts the connection.

SOLUTION: use ssh/scp to individual andrew computers; delete your ~/.ssh/known-hosts files if annoying messages pop-up, then try again.

Accessing a computer remotely

Use the "ssh remote_computer" command, where remote_computer is the name of the computer you want to access. If your computer does not have the ssh software installed, please contact Florin to get a free copy for your operating system.

If there is no way to get ssh installed and working on your computer, you can use the command "telnet remote_computer". Unless remote_computer is an andrew computer AND your telnet is kerberized, your login name and password will be plainly disclosed on the network. Please see the security implications for details.