Tech Tip
384
Networking Fundamentals
memory address
assignment
a large block of
memory assigned
to a device. It is
used to transfer
data between two
locations.
Redundant Array of
Independent Disks
(RAID)
a system of disks
arranged for speed
or fault tolerance, or
both.
this data until the CPU is free. Figure 9-17 shows the I/O port assignments
associated with a system’s hardware devices.
Memory Address Assignment
A memory address assignment is a large block of memory assigned to a
device and is used to transfer data between two locations. A device is assigned a
range of memory addresses. Some devices such as video and sound cards require
a great deal of memory. The blocks of RAM assigned to a device cannot be used
by any other device. Figure 9-18 shows the memory assignments associated with
a system’s hardware devices.
RAID Systems
Redundant Array of Independent Disks (RAID) is a system of disks
arranged for speed or fault tolerance, or both. Fault tolerance as applied to RAID
systems means the ability to recover from a hard disk or hard disk controller
failure without the loss of stored data. Fault tolerance as applied to a network
infrastructure means the ability to continue operation during a system hardware
or software error. To achieve a high-data transfer rate, a technique known as disk
striping is used. Disk striping involves dividing the data into separate sections
and writing the data across several hard disk drives at the same time. This
reduces the total amount of time it takes to store large amounts of data.
Another accepted representation of the RAID acronym is Redundant Array of Inexpensive
Disks.
Figure 9-17.
I/O port
assignments.