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This is a list of the latest tech reports available from
the Center for Information Technology Integration (CITI)
via anonymous ftp to citi.umich.edu:~citi/public/techreports.

The file INDEX, will give you a list of all the tech reports
CITI has available.

If you have any questions or difficulties please send a message
to info@citi.umich.edu.


1992

92-1   Third-Party Authentication in the Institutional File System
Jim Rees
Bill Doster
February 2, 1992
The use of intermediate translators in the Institutional File System
presents the problem of authenticating the translator to the file
server where the client's private key is not known to the translator.
We have implemented a modification to the Kerberos authentication
exchange that allows our translators to securely acquire the rights
necessary for them to access files and other services on behalf of
their clients.


92-2    Evaluating the Network System Corporation
Data Exchange Unit Performance
 under AIX/370
Charles J. Antonelli
June 9, 1992
This report presents the results of tests run to evaluate the
performance of Network Systems Corporation's Data Exchange Unit (DXU)
channel-to-FDDI interface.  (electronic copy not available, for a paper
copy, please send a message to info@citi.umich.edu and be sure to
include your address)

92-3    Faster AFS
Micahel T. Stolarchuk
June 22, 1992
The AFS Cache Manager fetches files from the AFS file server, and caches
them into a local file system. Given this model, users expect reads of locally
cached files to perform at local file system rates. However, read
performance of the AFS cached files is half the read performance of the
local file system. This paper discusses the reasons for the large
performance difference, and the modifications made to AFS so that reads
of locally cached files perform within 10% of the performance of the
local file system.

92-4 Intermediate File Servers in a Distributed File System Environment
James Howe
June 30, 1992
A component of the Institutional File System (IFS), the intermediate
file server addresses scaling and interoperability issues on the
University of Michigan cam pus.  The IFS is based on AFS, a distributed
file system from Transarc.  Interme diate servers provide protocol
translation that enables non-AFS clients to easil y access the
distributed file system.  For example, Macintosh users can manipula te
UNIX files that reside on the server by moving folders and icons, just
as the y would manipulate local Macintosh files.  Intermediate servers
also offer other benefits, such as multi-level caching and data
preloading, that increase the ca pacity of the network by reducing the
load on central server.

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