director product manager user guide
Glossary–17
Glossary
port name
Name that the user assigns to a particular port through the Product Manager.
POST
See power-on self test.
power-on self test (POST)
Series of self-tests executed each time the unit is booted or reset.
preferred domain ID
Domain ID that a director or switch is assigned by the principal switch in a switched fabric.
The preferred domain ID becomes the active domain ID except when configured otherwise by
the user.
principal switch
The director or switch that allocates domain IDs to itself and to all other switches in a fabric.
There is always one principal switch in a fabric. If a switch is not connected to any other
switches, it acts as its own principal switch.
product name
User-configurable identifier assigned to a managed product. Typically, this name is stored on
the product itself. For the Director 2/64, the product name can also be accessed by an SNMP
manager as the system name.
prohibited port connection
In S/390 operating mode, an attribute that removes dynamic connectivity capability.
R_A_TOV
See resource allocation time-out value.
redundancy
Performance characteristic of a system or product whose integral components are backed up
by identical components to which operations will automatically failover in the event of a
component failure. Redundancy is a vital characteristic of virtually all high-availability (24
hours per day, seven days per week) computer systems and networks.
remote access link
Connection to a device or program on a computer network via a (geographically) remote
workstation.
