HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Command Line Interface Reference Guide (EK-G80CL-RA. C01, March 2005)

Glossary
323HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Command Line Interface Reference Guide
host adapter
A device that connects a host system to a SCSI bus. The host adapter usually performs the
lowest layers of the SCSI protocol. This function may be logically and physically integrated
into the host system.
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 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-pluggable
A replacement method 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 pluggable.
HP StorageWorks
An HP brand name for a family of modular data storage products that allow customers to
design and configure their own storage subsystems. Components include power, packaging,
cabling, devices, controllers, and software. Customers can integrate devices and controllers
in HP StorageWorks enclosures to form storage subsystems. HP StorageWorks systems
include integrated devices and controllers to form storage subsystems.
HSUTIL
Format and Device Code Load Utility.
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. Also called driver.
I/O interface
See interface
I/O module
A device that integrates an enclosure with either an 8-bit single-ended SCSI bus, 16-bit
single-ended SCSI bus, 16-bit differential SCSI bus, or Fibre Channel bus.