HP StorageWorks HSG80 ACS Solution Software V8.8 for Windows NT, Windows 2000, and Windows Server 2003 (32-bit) Installation and Configuration Guide (AA-RV1XA-TE, March 2005)

Glossary
279HSG80 ACS Solution Software V8.8 for Windows NT, Windows 2000, and Windows Server
2003 (32-bit) Installation and Configuration Guide
host
compatibility
mode
A setting used by the controller to provide optimal controller
performance with specific operating systems. This improves the
controller performance and compatibility with the specified operating
system.
hot disks A disk containing multiple hot spots. Hot disks occur when the
workload is poorly distributed across storage devices which prevents
optimum subsystem performance. See also hot spots.
hot spots A portion of a disk drive frequently accessed by the host. Because the
data being accessed is concentrated in one area, rather than spread
across an array of disks providing parallel access, I/O performance is
significantly reduced. See also hot disks.
hot swap or
hot-pluggable
A method of device replacement that allows normal I/O activity on a
device bus to remain active during device removal and insertion. The
device being removed or inserted is the only device that cannot perform
operations during this process. See also cold swap and warm swap.
hub A device (concentrator) which performs some or all of the following
functions:
■ Automatic insertion of operational loop devices without disrupting
the existing configuration.
■ Automatic removal of failed loop devices without impacting the
existing configuration.
■ Provides a centralized (star) wiring configuration and maintenance
point.
■ Provides central monitoring and management.
IBR Initial Boot Record.
ILF Illegal function.
INIT Initialize input and output.
initiator A SCSI device that requests an I/O process to be performed by another
SCSI device, namely, the SCSI target. The controller is the initiator on
the device bus. The host is the initiator on the host bus.
instance code A four-byte value displayed in most text error messages and issued by
the controller when a subsystem error occurs. The instance code
indicates when during software processing the error was detected.
interface A set of protocols used between components, such as cables,
connectors, and signal levels.