Acer SmartRAID V Bedienungsanleitung Seite 244

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Seitenansicht 243
G-4
Glossary
EDO DRAM
Extended Data Output DRAM. A type of RAM
that improves memory read performance on
systems that are designed to use EDO memory.
Elevator Sorting
A method of sorting records or cache pages by
physical location on disk so that the information
can be written to disk with less seek and
rotational latency.
Events
Messages generated by DPT controllers for
detected fault conditions or subsystem status
changes.
Failed
The mode of operation of a drive or array in
which the drive or array, because of a
malfunction, can no longer be accessed.
Fast SCSI
The SCSI-2 standard for synchronous transfers
at up to 10MHz. This provides a transfer speed
of 10MB/sec for an 8-bit bus and 20MB/sec for a
16-bit bus. Devices that utilize these faster
timings are called Fast SCSI devices. The
original SCSI standard defined a 5MHz transfer
rate.
Fast-20 SCSI
See Ultra SCSI.
Fast-40 SCSI
See Ultra2 SCSI.
FC-AL
Fibre Channel Arbitrated Loop A Fibre
Channel topology where up 126 devices are
connected in a serial (loop) fashion. The devices
negotiate individually for use of the bus. See
also, Fibre Channel.
Fibre Channel
A standard set of protocols for information
transfer. Fibre Channel provides for high speed
transfer of information over long cable lengths.
Fibre Channel controllers can transfer data at
up to 100MB/sec. among up to 126 devices over
30 meters of copper or 10 km of optical cable.
Flash ROM
A nonvolatile memory device on the controller
that can be reprogrammed using special
software without removing it from the board.
Flush
The action of writing all dirty data in the cache
to disk.
Hardware Array
A group of disk drives that are all members of
the same RAID level 1 or 5 array managed by a
DPT controller and which appears to the
computer as one storage device.
HBA
Host Bus Adapter Refers to a DPT or other
controller card that provides host computer
access to the peripheral bus.
HDM
Hardware Device Module. The part of the I
2
O
split device driver that resides within the
firmware of the device.
Hit
A data access in which the requested data is
found in the cache.
Hit Ratio
The ratio of cache hits to total disk accesses. A
hit ratio of 100% means that all disk accesses
were serviced from the cache.
Hot Plug
The operation of adding or removing a device
from a bus while transactions involving other
devices are occurring over the bus.
Hot Spare
A disk drive that is assigned to automatically
replace a failed disk drive.
Hot Swap
The operation of removing a failed disk drive
that is a member of a redundant array and
replacing it with a good drive while transactions
involving other devices are occurring over the
bus. Synonymous with Hot Plug.
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