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B-4 Glossary
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
Host Computer Any computer to which disks are directly attached. Mainframes, servers,
workstations, and personal computers can all be considered host
computers.
Hot Spare A stand-by disk drive ready for use if a drive in an array fails. A hot spare
does not contain any user data. Up to eight disk drives can be assigned
as hot spares for an adapter. A hot spare can be dedicated to a single
redundant array, or it can be part of the global hot-spare pool for all
arrays controlled by the adapter.
Hot Swapping The substitution of a replacement unit in a disk subsystem for a defective
one, where the substitution can be performed while the subsystem is
running. Hot swaps are done manually.
I/O Driver A host computer software component (usually part of the operating
system) that controls the operation of peripheral controllers or adapters
attached to the host computer. I/O drivers communicate between
applications and I/O devices, and in some cases they participate in data
transfer.
Initialization The process of writing zeros to the data fields of a logical drive and
generating the corresponding parity to put the logical drive in a Ready
state. Initializing erases previous data and generates parity so that the
logical drive will pass a consistency check. Arrays can work without
initialization, but they can fail a consistency check because the parity
fields have not been generated.
Logical Disk A set of contiguous chunks on a physical disk. Logical disks are used in
array implementations as constituents of logical volumes or partitions.
Logical disks are normally transparent to the host environment, except
when the array containing them is being configured.
Logical Drive A virtual drive within an array that can consist of more than one physical
drive. Logical drives divide the contiguous storage space of an array of
disk drives or a spanned group of arrays of drives. The storage space in
a logical drive is spread across all the physical drives in the array or
spanned arrays. Configure at least one logical drive for each array.
Mapping The conversion between multiple data addressing schemes, especially
conversions between member disk block addresses and block addresses
of the virtual disks presented to the operating environment by array
management software.