Compaq AlphaServer GS60 Operation Manual page 334

Disk array
A set of disk drives and a specialized aarray controller, which keeps track of how
data is distributed across the drives.
Drive group
A set of drives logically tied together and addressed as a single unit.
DSSI
DIGITAL Storage Systems Interconnect. A DIGITAL Storage Architecture
interconnect used by the KFMSB adapter and RF and TF series integrated storage
elements to transfer data and to communicate with each other.
DSSI PIU
Houses DSSI based disks inside the system and expander cabinets (BA654).
DWLMA
An XMI adapter that is the interface between the TLSB bus and the XMI bus;
always node 8 of the XMI. The XMI plug-in unit includes the T2028-AA module
and necessary cables and the XMI clock card. See also XMI PIU and XMI clock.
DWLPA/DWLPB
A PCI adapter, housed in a unit that provides a PCI card cage, that is the interface
with the TLSB. Note that the KFE72 adapter, used with systems using a graphics
console monitor, is only supported by the DWLPB.
ECU
EISA (system) configuration utility used to configure EISA option boards.
EISA bus
Extended Industry Standard Architecture bus. A 32-bit industry standard I/O bus
used primarily in high-end PCs and servers.
Environment variables
UNIX-like options used with SRM console commands. An environment variable
consists of an identifier (ID) and a byte stream value maintained by the console.
See also Console language.
Expander cabinet
A cabinet to hold additional I/O adapters or storage units that can be installed on
either side of the system cabinet.
FDDI
Fiber Distributed Data Interface. A high-performance fiber optic network that can
be accessed by the XMI DEMFA, PCI DE435, FBUS+ DEFAA, or EISA DEFAA
adapters.
Filler module
Required to fill unused TLSB slots when fewer than six CPU, memory, or I/O
modules are installed.
Glossary-4