Installation guide

Glossary
ADAPTER
A module that connects one or more device controllers to the host bus and
hides many of the host bus requirements from the controller. The KFMSA
module is an XMI to DSSI bus adapter.
ALLOCATION CLASS
A numerical value assigned to the ISE to indicate which host(s) on a
cluster it will be served by.
BAD BLOCK
An address on a disk or tape that is determined by the device controller
to be bad and, therefore, in need of replacement.
BAD BLOCK REPLACEMENT
The procedure used to locate a replacement block, mark the bad block as
replaced, and move the data from the bad block to the replacement block.
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.
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).
DMA
Direct memory access.
DRVTST
A local program resident on the ISE. It is a comprehensive hardware test
used to verify ISE operation.
Glossary–1