HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide (EK-G80TS-SA. C01, March 2005)

Glossary
286 HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide
hot disks
A disk containing multiple hot spots. Hot disks occur after the workload is poorly
distributed across storage devices, preventing 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
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 array controllers in
HP StorageWorks enclosures to form storage subsystems. HP StorageWorks systems
include integrated devices and array controllers to form storage subsystems.
HSUTIL
A 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. Same as 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.
I/O operation
The process of requesting a transfer of data from a peripheral device to memory (or vice
versa), the actual transfer of the data, and the processing and overlaying activity to make
both of those happen.