Acer SmartRAID V Bedienungsanleitung Seite 246

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Seitenansicht 245
G-6
Glossary
MTBF
Mean Time Between Failure. The average time
between expected failures of a device in a large
sample group of devices.
Multilevel RAID
A method of combining multiple RAID 1 or
RAID 5 arrays into a single array, providing
increased storage and performance in multi-
user environments.
Non-Redundant Array
An Array Group with no fault tolerance
(RAID 0). If only one drive in a non-redundant
array fails, the entire array will fail.
NVRAM
Nonvolatile Random Access Memory. Hardware
memory that stores data even when system
power is turned off. SmartRAID controllers
store their setup information in NVRAM.
Operating System
Software that manages the resources of a
computer and provides the operating
environment for application programs.
Optimal
The mode of operation of a disk array in which
no drive failures have occurred.
OSM
Operating System Module. A system-level
software module that provides communication
between the host operating system and the
intelligent hardware controller. See also HDM.
Page
The smallest region of cache which can be
allocated to store data. Each page stores one
512-byte sector from disk.
Parity
A method of generating redundant information
which can be used to detect errors in stored or
transmitted data. Parity is used in standard
memory modules and over the peripheral bus to
detect data errors. Parity is used in RAID 5 disk
arrays to reconstruct flawed or missing data
sectors.
PCI
Peripheral Component Interconnect. An
intelligent computer bus specification that
provides automatic configuration of peripheral
cards. The bus supports 32-bit data paths at a
132 MB/sec data transfer rate or 64-bit data
paths at a 264 MB/sec data transfer rate.
PIO
Programmed Input/Output. A method of data
transfer where data is moved between a
peripheral controller and system memory by the
CPU.
Plug-and-Play
The ability to install peripheral cards or devices
without requiring a user to configure interrupts
or addressing for the device.
Plug-and-Play BIOS
A part of the system BIOS in PCI computers
that has the ability to automatically configure
PCI peripheral cards so that there are no
conflicts with other installed devices.
Predictive Caching
A method of analyzing disk I/O requests to
improve system performance by predicting
which data is likely to be needed in the near
future. The data is then read into the physical
cache.
RAID
Redundant Array of Independent Disks. A
method of combining disk drives into one logical
storage unit that provides disk-fault tolerance
and can operate at higher throughput levels
than a single disk drive.
Rebuild
The operation of restoring data belonging to a
failed member of a redundant disk array by
reconstructing the data from the other disks
and writing that data to a replacement disk
drive.
Redundant Array
A fault-tolerant disk array (for example, RAID 1
or RAID 5).
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