Dell PowerVault MD1120 User Manual download pdf (Page 60)

60 Glossary

graphics mode — A video mode that can be defined as x horizontal by y vertical pixels

by z colors.

group — As it relates to DMI, a group is a data structure that defines common

information, or attributes, about a manageable component.

guarding — A type of data redundancy in which a set of physical disks stores data and

an additional physical disk stores parity data. See also mirroring, striping, and RAID.

h — Hexadecimal. A base-16 numbering system, often used in programming to

identify addresses in the system’s RAM and I/O memory addresses for devices. In text,

hexadecimal numbers are often followed by h.

headless system — A system or device that functions without having a keyboard,

mouse, or monitor attached. Normally, headless systems are managed over a network

using an Internet browser.

host adapter — A host adapter implements communication between the system’s bus

and the controller for a peripheral device. (Physical disk controller subsystems include

integrated host adapter circuitry.) To add a SCSI expansion bus to your system, you

must install or connect the appropriate host adapter.

hot-pluggable — The ability to remove a system component or attached device

without powering down the system. While a component may be "hot-pluggable," you

should never remove a component or device while data traffic is occurring that

involves the component. For more information, see the documentation for your

specific component or device.

Hz — Hertz.

I/O — Input/output. A keyboard is an input device, and a monitor is an output

device. In general, I/O activity can be differentiated from computational activity.

ID — Identification.

IDE — Integrated drive electronics. A standard interface between the system board

and storage devices.

integrated mirroring — Provides simultaneous physical mirroring of two physical

disks. Integrated mirroring functionality is provided by the system’s hardware. See

also mirroring.

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Dell PowerVault MD1120 User Manual Page 60