Installation guide

Glossary
adapter
A module that connects one or more device controllers to the system bus and
hides many of the system bus requirements from the controller. The KFQSA
module is an Q-bus to DSSI bus adapter. The KFMSA module is an XMI to
DSSI bus adapter.
allocation class
A numerical value assigned to the ISE to indicate which system(s) on a cluster
it will be served by.
block
The smallest data unit addressable on a disk. Also called a sector. In DSSI
ISEs, a block contains 512 bytes of customer data, EDC, ECC, flags, and the
block’s address header.
DECarray
A storage array that houses up to six storage enclosures and up to two
magazine tape ISEs (such as the TF857).
device name
A unique name given to each device by the VMS operating system. The device
name generally includes either the allocation class and MSCP unit number
assigned to the device (if the allocation class is not zero), or the node name and
MSCP unit number (if the allocation class is zero).
DRVTST
A local program resident on the ISE. It is a comprehensive hardware test used
to verify ISE operation.
Glossary–1