Attached Storage (NAS)
Information Technology (IT) departments are looking for cost-effective storage
solutions that can offer performance, scalability, and reliability. As users on
the network increase and the amounts of data generated multiply, the need for
an optimized storage solution becomes essential. Network Attached Storage (NAS)
is becoming a critical technology in this environment.
The benefit of NAS over the older Direct Attached Storage (DAS) technology is
that it separates servers and storage, resulting in reduced costs and easier implementation.
As the name implies, NAS attaches directly to the LAN, providing direct access
to the file system and disk storage. Unlike DAS, the application layer no longer
resides on the NAS platform, but on the client itself. This frees the NAS processor
from functions that would ultimately slow down its ability to provide fast responses
to data requests.
In addition, this architecture
gives NAS the ability to service both Network File System (NFS) and Common Internet
File System (CIFS) clients. As shown in the figure below, this allows the IT manager
to provide a single shared storage solution that can simultaneously support both
Windows*-and UNIX*-based clients and servers. In fact, a NAS system equipped with
the right file system software can support clients based on any operating system.
NAS is typically implemented as a network appliance, requiring a small form factor
(both real estate and height) as well as ease of use. NAS is a solution that meets
the ever-demanding needs of today's networked storage market
In basic terms,
network storage is simply about storing data using a method by which it can be
made available to clients on the network. Over the years, the storage of data
has evolved through various phases. This evolution has been driven partly by the
changing ways in which we use technology, and in part by the exponential increase
in the volume of data we need to store. It has also been driven by new technologies,
which allow us to store and manage data in a more effective manner.
In the days of mainframes, data was stored physically separate from the actual
processing unit, but was still only accessible through the processing units. As
PC based servers became more commonplace, storage devices went 'inside the box'
or in external boxes that were connected directly to the system. Each of these
approaches was valid in its time, but as our need to store increasing volumes
of data and our need to make it more accessible grew, other alternatives were
needed. Enter network storage.
is a generic term used to describe network based data storage, but there are many
technologies within it which all go to make the magic happen. Here is a rundown
of some of the basic terminology that you might happen across when reading about
Direct Attached Storage
Direct attached storage is the term
used to describe a storage device that is directly attached to a host system.
The simplest example of DAS is the internal hard drive of a server computer, though
storage devices housed in an external box come under this banner as well. DAS
is still, by far, the most common method of storing data for computer systems.
Over the years, though, new technologies have emerged which work, if you'll excuse
the pun, out of the box.
Network Attached Storage (NAS)
Storage, or NAS, is a data storage mechanism that uses special devices connected
directly to the network media. These devices are assigned an IP address and can
then be accessed by clients via a server that acts as a gateway to the data, or
in some cases allows the device to be accessed directly by the clients without
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