Thursday, May 29, 2008

STORAGE AREA NETWORK (SAN)

A SAN is a specialized, high-speed network attaching SERVERS and STORAGE DEVICES. A SAN allows “any-to-any” connection across the network, using interconnects elements such as routers, gateways, hubs, SWITCHES and DIRECTORS.

It eliminates the traditional dedicated connection between a server and storage, and the concept that the server effectively “owns and manages” the storage devices. It also eliminates any restriction to the amount of data that a server can access, currently limited by the number of storage devices attached to the individual server.

Instead, a SAN introduces the flexibility of networking to enable one server or many heterogeneous servers to share a common storage utility, which may comprise many storage devices, including disk, tape, and optical storage. Additionally, the storage utility may be located far from the servers that use it.

It can be local, or can be extended over geographical distances. SANs create new methods of attaching storage to servers. These new methods can enable great improvements in both availability and performance.

Today’s SANs are used to connect shared storage arrays and tape libraries to multiple servers, are used by clustered servers for failover and are used to bypass traditional network bottlenecks. It facilitates direct, high-speed data transfers between servers and storage devices.
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Friday, May 23, 2008

OMNET++ with VISUAL C++ 2005

Here are simple steps:


  • download visual c++ express from microsoft webpage, the installation must be done online.
  • but this one will only work for the omnet samples simulation (example: tictoc.exe) or .exe files that are already created. if YOU want to create new omnet simulation YOU need to have the original or full version of visual c++ 2005. since the express version does not contain program to run 'nmake' statement.
  • download omnet++ from omnet webpage, make sure the version is for windows and visual c++ 2005
  • make sure YOU have installed visual c++ 2005 before installing omnet++
  • some of the omnet version require Windows rebooting some does not. so make sure you save those running applications.
  • then you can start testing the samples provided by the version.
  • more steps....coming

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Thursday, May 15, 2008

AUTOIT..

Getting to know AUTOIT

  • a freeware designed to automate Windows GUI and general scripting.
  • very small in size, self-contained and will run on all versions of Windows.
  • supports complex expressions, user functions, and loops.
  • suitable for those who are not Windows expert (exm: with one click button, you can run multiple .bat command)

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OMNeT++

OMNeT++ ... What Is IT????
  • OMNeT++ a discrete event simulation, mainly of communication networks.
  • OMNeT++ can be used in other areas, example simulation of complex IT systems, queueing networks or hardware architectures as well.
  • OMNeT++ extensive GUI support, and the simulation kernel can be embedded easily into other applications.
  • OMNeT++ comes with different version or suits depending on the platforms.guess what??... it is free for noncomercial purpose -- academic research.




Platforms:

  • Windows
  • Linux Knoppix
  • Ubuntu


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Working with NS2

What is NS-2?
  • Network Simulator 2.
  • It is an open-source software which can be freely downloaded from its official website.
  • There are many available versions with different protocol of interest.
  • Basically, the procedures of NS-2 simulation execution involve providing traffic pattern and mobility pattern to a simulation scenario
  • The results obtained may be in the form of raw data and that can be interpreted by using appropriate programming language


Platform ...
  • Linux Knoppix
  • Ubuntu
  • Windows
  • Red hat

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