OSF DCE Administration Guide--Introduction

Introduction to DCE for Administrators
• GDS entries managed by GDS’s own ACL mechanism, as described in the
An ACL consists of multiple ACL entries that define the following:
• Who can use an object
• What operations can be performed on the object
In the filespace, ACLs are an extension of the UNIX system’s file protection model.
Whereas UNIX file system permissions are limited to the protection of files and
directories, DCE ACLs can also control access to other objects, such as individual
database entries, objects registered in the cell namespace, and objects managed by
applications.
1.8 Caching
Information acquired over the network (for example, through the use of DCE RPC) can
be stored in a memory or disk cache on the local machine. This technique reduces
network load and speeds up lookups of frequently needed data. For example, information
about the namespace and the filespace is cached by DCE client machines.
Caching can be configured on a service-by-service basis. Different caching mechanisms
are used for different components of DCE. Each component has configurable options to
improve the performance of your installation.
1.9 Replication
Replication increases the availability of resources by having copies of the resource on
several machines. For example, with replication you can make database updates on one
machine and have them automatically made on other machines in the network. You can
replicate data, move replicas, and control the frequency of updates. The Security Service,
CDS, GDS, and DFS all provide replication facilities that are customized for their
particular applications.
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