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Subj: 29Nov89 IEEE talk: Apollo on Comprehen Distrib Computing Environ
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Date: Sat, 11 Nov 89 17:41:12 -0800
From: rothstein@bcse.enet.dec.com
Subject: 29Nov89 IEEE talk: Apollo on Comprehen Distrib Computing Environ
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PLEASE POST AND REDISTRIBUTE
IEEE Computer Society, New Hampshire Section
Computer Science Seminar Series
Seminar: DEcorum and NCS: A Comprehensive Distributed Computing
Environment.
By: Paul J. Leach, Apollo Systems Division of
Hewlett-Packard Company.
On: Wednesday, November 29, 1989, 7:30 PM
At: Building ZKO1, Babbage Auditorium
Digital Equipment Corporation
110 Spit Brook Road
Nashua, NH 03062
Attendance: Talks are free and open to the public. IEEE Membership
is *not* required. RSVP is also *NOT* required, but
is encouraged.
Sponsor: NH Section, IEEE Computer Society.
If further information is required, contact:
Lee Rothstein, Mail Stop ZKO3-2/W21
Digital Equipment Corporation
110 Spit Brook Road
Nashua, NH 03062
603-881-0771
Easynet Email: BCSE::ROTHSTEIN or Lee Rothstein @ ZKO
UUCPnet: {purdue,ucbvax,hplabs,labrea,sun,pyramid,
gryphon,angelo}!bcse.dec.com!rothstein
ARPAnet/Domain Addressing:
rothstein@BCSE.Enet.dec.com
BITNET: rothstein@bcse.dec%decwrl.dec.com
Email address clues, complaints, suggestions and alternatives
gratefully accepted!
DEcorum and NCS: A Comprehensive Distributed Computing
Environment.
======================================================
DEcorum is an integrated collection of software components,
built on NCS, that provide a comprehensive distributed computing
environment. It is being submitted to the OSF in response to the
OSF Distributed Applications Environment RFT. DEcorum is a
layered architecture that combines innovation with a strong
commercial base by including commercially available, innovative
products and technologies, as well as the results of advanced
research projects conducted by major universities. The
technological bases for DEcorum include AFS, Kerberos, LAN
Manager/X (LMX), Network Computing System (NCS), Network Time
Protocol (NTP), and Transparent Computing Facility (TCF), among
others. The proposal meets all of the mandatory and many of the
desired requirements of the RFT.
While these technologies provide a uniquely functional
collection of services for the present, the modularity of
DEcorum also makes it an excellent basis for the inevitable
continued evolution of the package over the long term. In
particular, various software layers can be modified or
substituted with more advanced technologies, as they become
available.
DEcorum provides tools for developers to implement applications
for distributed environments. These include a threading library
based on the proposed POSIX standard; a remote procedure call
stub compiler based on NCS; connectivity based upon
session-based, OSI protocols; an authentication scheme based on
Kerberos; a shared remote file system; transparent remote
processing; and a flexible naming service that is positioned for
migration to the emerging X.500 standard. DE also provides a
substantial set of system administration functions, including a
time service based on the NTP standard, account administration
tools, and network administration tools.
The DEcorum distributed file system supports small sites, but
also can support increasingly large heterogeneous networks,
including those made up of multiple administrative domains
(cells), and spread over large distances. The file system
provides access transparency, high performance (due to extensive
file catching, streaming RPC protocols, and replication ), and a
high degree of security (due to distributed authentication and
access control lists). The modularity and flexibility of the
system allow for interoperability with existing UNIX and
non-Unix file systems. Systems supported include diskless
workstations, DOS or OS/2 clients.
DEcorum permits a distributed system to function as a tightly
coupled cluster of resources offering many of the attributes of
a single system. The exceptional level of transparency in the
case of clustered operation encompasses file system services,
remote device access, cross machine processing, and user
displays: all with minimal or no application software impact.
Paul J. Leach
=============
Paul J. Leach is an Apollo Fellow, and a founder of Apollo
Computer, Inc.--now the Apollo Systems Division of
Hewlett-Packard. He was one of the architects of the Apollo
operating system and its object-oriented distributed file
system, and of the Apollo Network Computing System (NCS). His
current interests are in multi-media, distributed, object
oriented systems and engineering methodologies.
Please join me in welcoming Paul to New Hampshire, and IEEE.
DIRECTIONS TO:
Digital Equipment Corporation/ZKO1 Lobby & Babbage Auditorium
From points south in Boston/Cambridge:
* Drive North on Rt 3 to the New Hampshire border. (MA Rt 3
[is it US 3?] becomes NH Rt 3/Everett Turnpike.)
* Just 'round the first corner from the NH border is NH Exit 1;
look carefully for it, it's easy to miss.
* Take that right-hand exit down the hill to some stop lights.
* Turn left at the lights onto Spit Brook Road.
* Go under Rt 3, pass one or two (?) more sets of lights.
* The Sheraton Tara is on your right as you drive along Spit
Brook Road.
* Just past the Sheraton, there is a large driveway entrance
on your right at a traffic light.
* Turn right into it and follow it down hill.
* At the bottom of the hill you can turn right (at a traffic
light) to go to the Sheraton or left for Digital.
* Bear left, go up the hill and you will see Digital signs
pointing to parking lots.
* Pass the turn-off road on the left to ZKO3.
* Follow the signs to the "Lobby" (this is the Main Lobby--the
Lobby of Building ZK1) and Parking Lots A, B, or C. Park in
an open spot as near to the Lobby as possible.
* Talks are held in the Babbage Auditorium. As you enter the
ZK1 Lobby, you turn right down the hall. The auditorium
is the first right as you go down the hall.
* Should you miss NH Exit 1 on Rt 3, the next exit you reach is
Exit 4. (Exit 2 hasn't been built yet, and Exit 3 is an
on-ramp only going North.)
* At Exit 4 you can either turn back on Rt 3, or take a left
(this is East Dunstable Road), keep going (about a mile) on
this road to a "T" junction, and take a left, this is Spit
Brook Road, and you will come back to Digital and the Tara,
as described in the base note. (Incidentally, Exit 4 is the
location of the Nashua Holiday Inn.)
Lee Rothstein Easynet: BCSE::ROTHSTEIN
Mail Stop ZKO3-2/W21 or: Lee Rothstein @ ZKO
Digital Equipment Corporation FAX: 603-881-0120
110 Spit Brook Road Phone (DID): 603-881-0771
Nashua, NH 03062 DTN: 381-0771
UUCP/Unix Sendmail: {purdue,ucbvax,hplabs,labrea,sun,pyramid,
gryphon,angelo}!decwrl!bcse.dec.com!rothstein
ARPAnet/Domain Addressing: rothstein@bcse.enet.dec.com
BITNET: rothstein@bcse.dec%decwrl.dec.com