DS notes #4

dt - 24/1/17

DCE - Distributed Computing Environment

• Defined - OSF (Open Software Foundation) includes IBM
• not an OS - not application
• Set of tools and services

            - installed - OS

            - Platform - distributed Application

                 For example- windows, linux

                                        Domain OS, VMS

• Used network, hardware and transport softwware

Fig- DCE based distributed system

IDEA

• Collection systems - interconnected - add DCE Software
• Hides differences between machines.

• DCE Components

1. Thread package
2. RPC
3. Distiributed Time services - DTS Synchronization clocks of all system.
4. Name Services-

                  - Cell Directory Service - CDS

                  - Global Directory Services - GDS

                  - Global Directory Agent - GDA

                  - Resources -uniquely named and accessed.

     5)   Security services

                Tools - authentication - authorization.

     6)   Distributed File system (DFS)