Availability Guide for Change Management

Making Communications Subsystem Changes
Online
Availability Guide for Change Management–125506
5-4
LAN Connections
LAN Connections
LAN connections include products that allow NonStop systems, workstations, and other
systems and devices to communicate across LANs. Tandem offers LAN interface
products based on standard and de facto standard LAN protocols. Tandem LAN
connectivity allows NonStop systems and Expand networks to be integrated with
existing LANs.
TCP/IP Network Connections
Tandem’s TCP/IP products can be used to integrate NonStop systems with UNIX
systems, multivendor host networks, and workstations using the TCP or related User
Datagram Protocol (UDP) and IP.
Common Communications Subsystem Changes
Because Tandem provides so many communications subsystems, it is not possible in this
section to describe all of the potential changes to every subsystem. However, the types
of changes you want to make, and how you make changes, are often common to multiple
subsystems. This subsection describes the types of changes and tools that are common
to most communications subsystems.
Changes You Can Perform Online
Making changes to a communications subsystem does not require the NonStop system
to be shut down, and—depending on network and application design considerations—
changes may be made without affecting application availability. The following are
common communications subsystem changes that can be performed online:
•
Adding communications lines, devices, and subdevices
•
Deleting communications lines, devices, and subdevices
•
Altering the characteristics of communications lines, devices, and subdevices
The following subsection describes the tool you can use to make these changes online.
Communications Subsystem Tool
Many of the operational attributes of communications subsystems can be changed online
using the Subsystem Control Facility (SCF).
SCF
SCF is a management application within the Distributed Systems Management (DSM)
architecture. You can use SCF to make changes to most communications subsystems
without having to take your NonStop system down. Table 5-1 on page 5-5 lists the
communications subsystems that can be changed with SCF.
SCF provides a series of commands that operate on objects belonging to each
communications subsystem. Each communications subsystem has its own set of object
types relevant to the subsystem’s configuration and implementation.