Tuesday, June 5, 2012

Demerits of Cloud Computing

While cloud computing and storage is a great innovation in the field of computing, However, there are certain things that you need to be cautious about too. Some may say that there are no down sides to cloud computing, but users should not depend too heavily on these services. Although you may find all you need with a particular service, you have to consider the security and portability it offers and also make contingencies should the service be terminated abruptly.
Moreover, an online service is more prone to threats than your PC. Having said that, however, most would agree that with cloud computing, the good outweighs the bad.
The main disadvantages are Security and Privacy, Dependency (loss of control), Cost ,Decreased flexibility ,Knowledge  And Integration.

1.Security & Privacy

The biggest concerns about cloud computing are security and privacy. Users might not be comfortable handing over their data to a third party. This is an even greater concern when it comes to companies that wish to keep their sensitive information on cloud servers. While most service vendors would ensure that their servers are kept free from viral infection and malware, it Is still a concern considering the fact that a number of users from around the world are accessing the server. Privacy is another issue with cloud servers. Ensuring that a client’s data is not accessed by any unauthorized users is of great importance for any cloud service. To make their servers more secure, cloud service vendors have developed password protected accounts, security servers through which all data being transferred must pass and data encryption techniques. After all, the success of a cloud service depends on its reputation, and any sign of a security breach would result in a loss of clients and business.

2.Dependency (loss of control):

  • Quality problems with CSP(Cloud Service Providers).No influence on maintenance levels and fix frequency when using cloud services from a CSP.
  • No or little insight in CSP contingency procedures. Especially backup, restore and disaster recovery.
  • No easy migration to an other CSP.
  • Measurement of resource usage and end user activities lies in the hands of the CSP
  • Tied to the financial health of another Company.


Higher costs. While in the long run, cloud hosting is a lot cheaper than traditional technologies, the fact that it’s currently new and has to be researched and improved actually makes it more expensive. Data centers have to buy or develop the software that’ll run the cloud, rewire the machines and fix unforeseen problems (which are always there). This makes their initial cloud offers more expensive. Like in all other industries, the first customers pay a higher price and have to deal with more issues than those who switch later (although it would be very hard to create and improve new technologies without these initial adopters).

4.Decreased flexibility

This is only a temporary problem (as the others on this list), but current technologies are still in the testing stages, so they don’t really offer the flexibility they promise. Of course, that’ll change in the future, but some of the current users might have to deal with the facts that their cloud server is difficult or impossible to upgrade without losing some data, for example.

5.Knowledge  And Integration.

More and deeper knowledge is required for implementing and managing SLA contracts with CSP’s ,Since all knowledge about the working of the cloud (e.g. hardware, software, virtualization, deployment) is concentrated at the CSP, it is hard to get grip on the CSP.

Integration with equipment hosted in other data centers is difficult to achieve. Peripherals integration. (Bulk)Printers and local security IT equipment (e.g. access systems) is difficult to integrate. But also (personal) USB devices or smart phones or groupware and email systems are difficult to integrate

How does cloud computing works?

Let's say you're an executive at a large corporation. Your particular responsibilities include making sure that all of your employees have the right hardware and software they need to do their jobs. Buying computers for everyone isn't enough -- you also have to purchase software or software licenses to give employees the tools they require. Whenever you have a new hire, you have to buy more software or make sure your current software license allows another user. It's so stressful that you find it difficult to go to sleep on your huge pile of money every night.
Soon, there may be an alternative for executives like you. Instead of installing a suite of software for each computer, you'd only have to load one application. That application would allow workers to log into a Web-based service which hosts all the programs the user would need for his or her job. Remote machines owned by another company would run everything from e-mail to word processing to complex data analysis programs. It's called cloud computing, and it could change the entire computer industry.
In a cloud computing system, there's a significant workload shift. Local computers no longer have to do all the heavy lifting when it comes to running applications. The network of computers that make up the cloud handles them instead. Hardware and software demands on the user's side decrease. The only thing the user's computer needs to be able to run is the cloud computing system's interface software, which can be as simple as a Web browser, and the cloud's network takes care of the rest.
There's a good chance you've already used some form of cloud computing. If you have an e-mail account with a Web-based e-mail service like Hotmail, Yahoo! Mail or Gmail, then you've had some experience with cloud computing. Instead of running an e-mail program on your computer, you log in to a Web e-mail account remotely. The software and storage for your account doesn't exist on your computer -- it's on the service's computer cloud.
For more info: http://goo.gl/JxXmr 

Thursday, April 5, 2012

How BLACK HOLES grow bigger?

Supermassive black hole
My curiosity about how black holes grow bigger made me to come across this article.... Check out....

Super massive black holes can grow still bigger by ripping apart double-star systems and swallowing on of the stars, says a new astrophysical study.
"Black holes are very efficient eating machine. They can double their mass in less than a billion years. That may seem long by human standards, but over the history  of the galaxy, it  is pretty fast. "This has got to be the dominant method for growing super massive black holes" believes Benjamin Bromley of the University of Utah, who led the study reports The Astrophysical Journal Letters.
Their works follows up on the 2005 discovery, by a team of CfA astronomers led by warren Brown, of hyper velocity stars - stars that were flung out of the galactic center by gravitational forces and are travelling fast enough to escape the Milky Way. Hyper-velocity stars can travel tens of thousands of times as fast as a bullet. They originated from a binary star system that wander too close to the Milky Way's central black hole. Tidal forces capture one star and eject the other.
The star that is captured into orbit around the black hole later becomes fodder for the galactic monster. As many as half of all the stars ate in binary pairs. The new study looked at each step in the process of a super massive black hole eater binary stars, and calculated what would be required for the process t match observations.
Their theory shows that the Milky Way's super massive black hole has doubled to quadrupled in mass during th e past five billion to 10 billion years by eating stars.

Hope it gave some helpful information...!
-Suryaseeplus ...!