Table of Contents
Advertisement
686DLX
1.6. What is AGP
The Accelerated Graphics Port (AGP) is a new port on the Host-To-PCI
bridge device that supports an AGP port. The main purpose of the AGP port
is to provide fast access to system memory.
The AGP port can be used either as fast PCI port (32-bits at 66MHz vs. 32-
bits at 33MHz) or as an AGP port which supports 2x data-rate, a read queue,
and side band addressing. When the 2x-data rate is used the port can
transmit data at 533Mb/sec (66.6*2*4). The read-queue can be used to
pipeline reads – removing the effects of the reads-latency. Side band
addressing can be used to transmit the data address on a separate line in
order to further speed the transaction.
1.7. What is RAID PORT
RAID PORT is the most popular in netware server applications. For example,
it is having four Levels 0, 1, 0/1 and 5 (The RAID Levels is depend on your
RAID CARD) .
RAID 0 (two driver minimum) is achieved by creating an array of striped
disks. IF one driver in a RAID 0 system fails, all data on the array will be lost.
RAID 0 is typically not used in network applications.
RAID 1 (two drivers) is as disk mirroring or duplexing. It's read performance
is very good, because data can be read from either the primary or mirrored
disk. However, it's write performance is slignhtly slower than with singal disks,
because two requests must be issued to write the same data to both drivers.
RAID 0/1 (four driver minimunm) is as RAID 0+1, combines the performance
of data striping (RAID 0) with the fault tolerance of RAID1.
RAID 5 (three drivers minimum) strips blocks of data as well as parity data
across all driver in the array, ensuring that no data will be lost in the event of
a single driver failure. RAID 5 delivers improved performance by allowing
multiple, simultaneous read and write requests but it unlike the other RAID
levels.
1-6
Advertisement
Table of Contents
