HP Array Controller HSG V8.7 Software - Manual (Page 535)

Glossary G–9
UNIX
®
, OpenVMS, Sun
®
, and Hewlett-Packard
®
HP–UX); B, IBM
AIX
®
; C, Proprietary; and D, Microsoft Windows NT
TM
Server.
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 A method of device replacement that allows normal I/O activity on a
device’s 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.
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.
I/O Refers to input and output functions.
I/O driver The set of code in the kernel that handles the physical I/O to a device.
This is implemented as a fork process. Same as driver.
I/O interface See interface.