director 2/64 installation guide

Glossary–14 director 2/64 installation guide
Glossary
packet
Logical unit of information (usually in the form of a data frame) transmitted on a network. It
contains a header (with all relevant addressing and timing information), the actual data, and a
trailer (which contains the error checking function, usually in the form of a cyclic redundancy
check).
password
Unique string of characters known to the computer system and to a user who must specify it to
gain full or limited access to a system and to the information stored within it.
path
In a network, any route between any two ports.
persistent binding
A form of server-level access control that uses configuration information to bind a server to a
specific Fibre Channel storage volume (or logical device) using a unit number.
port
Receptacle on a device to which a cable leading to another device can be attached.
port card
Field-replaceable hardware component that provides the port connections for fiber cables and
performs specific device-dependent logic functions.
port card map
Map showing numbers assigned to each port card by card slot.
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
Series of self-tests executed each time the unit is booted or reset.
preferred domain ID
Domain ID that a 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.
preventive service planning bucket
Collected problems after early ship of an IBM product.
principal switch
The switch that allocates domain IDs to itself and to all other switches in the 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.