User`s guide

10 Preface About This Guide
High-Performance Computing
Mac OS X Server offers a high-performance, cost-effective approach to computationally
intensive activities:
 Xgrid service. Xgrid computational service lets you achieve supercomputer
performance levels by distributing computations over collections of dedicated or
shared Mac OS X computers. The Xgrid cluster controller provides centralized access
to the distributed computing pool, referred to as a computational cluster.
 64-bit computing. Support for 64-bit processing includes 64-bit addressable
memory and the ability to run 64- and 32-bit applications simultaneously.
 Accelerated networking. Link aggregation lets you configure several physical
network links as a single logical link to improve the capacity of network connections.
You can also take advantage of jumbo frames and IP over FireWire to optimize
network transmissions.
User Access Management
Numerous new features in version 10.4 enhance your ability to both facilitate and
manage user access to services:
 Access Control Lists (ACLs). ACLs give you a way to craft share point, folder, and file
access permissions with a high degree of precision. A wide range of permissions can
be assigned to individual users and to groups, which can be nested. In addition, you
can use inheritance to propagate permissions through a file system hierarchy.
 Nested groups. A nested group is a group that’s a member of another group.
Nesting groups lets you manage groups of users at both a global level (when you
want to influence all members of a group) and at a smaller, more focused level (when
you want to influence only certain members of a group).