High availability Essay

In the coming of the computing machine age. the growing of the cyberspace has besides necessitated the development of engineerings that are non merely able to get by with the demands of users but besides within the restrictions of current hardware. With multitasking holding evolved into the norm. the handiness of media and applications online has made it progressively of import to supply high handiness ( Marcus 2003 ) .

The mission-critical applications that have surfaced on the cyberspace have placed added force per unit area to do certain that extremely available services are ever ready. As such. this brief discourse will try to discourse the current province of high handiness engineering every bit good as any recent tendencies or fluctuations that have surfaced. High Availability. as the term suggests. refers to systems or instruments in information engineering that are non merely continuously available but besides continuously operational for long periods of clip ( Marcus 2003 ) .

This text is NOT unique.

Don't plagiarize, get content from our essay writers!
Order now

The term handiness is used to mention to the entree that the users or members of user community have to the system. This type of entree or ability can include anything from uploading files. to altering entries. updating plants or even merely scanning old plants ( Marcus 2003 ) . The failure to entree the system consequences in downtime or inaccessibility. An illustration of this would be the mode by which community users like to be able to utilize Facebook to chew the fat. watch picture. update links and upload images all at the same clip.

We Will Write a Custom Essay Specifically
For You For Only $13.90/page!

order now

With a web that has Low Availability. the users will on occasion see failures with respect to logging in or accessing different maps of the web site because of the necessary downtime for system updating and care ( Ulrick 2010 ) . This downtime can be damaging for a web site or an internet application because it reduces the desirableness of the engineering. With the force per unit area on to supply complete and relentless handiness. companies have tried to accomplish the optimal “100 % operational” or “never failing” Availability Status. One manner of supplying about changeless handiness ( High Availability ) is by making bunchs.

These computing machine systems or webs consist of several pieces that act as back-ups or failover processing mechanism that shop informations and let for entree. This includes the Redundant Array of Independent Disks ( RAID ) or the Storage Area Network ( SAN ) . which are used as back up storage devices to guarantee changeless handiness ( Marcus 2003 ) . These systems. nevertheless. are invariably germinating and altering depending on the engineering that is available and developed such as systems that have solid rank disposal. consistent group communicating sub-systems. quoram sub-systems. and even coincident control sub-systems. among others.

By making a clustered computing machine system or web. backups are created in the signifier of redundancies for both hardware and package. This is achieved by organizing or grouping several independent nodes with each of them at the same time running a transcript of the operating system ( OS ) and the application package ( Marcus 2003 ) . Whenever there is a failure in any of the nodes or when daemon failures occur. the system can rapidly be reconfigured and the bing work load is so passed on to the other available or functional nodes within the bunch.

Therefore. there is ever. theoretically. one system that is available and running to manage the services and entree for the user community. It was reported in 1996 that the lost gross and productiveness due to downtime amounted to over US $ 4. 54 billion for American concerns entirely ( IBM 1998 ) . As such. High handiness has been systematically upgrading and germinating to be able to turn to this issue. The recent development include the creative activity of High Availability Clusters ( HA Clusters or Failover Clusters ) .

The construct of this is that it provides greater High Availability by runing several computing machine bunchs at the same clip. While this applies the same construct as High Availability. it attempts to make several failover systems and bunchs that cater to this. It does. nevertheless. retain the same construct of changeless monitoring to do certain that the systems are running as programmed and as planned. Recent research in this field has shown that there is besides a decreasing return rule that can be applied.

Up until late. it was thought that by making an expansive web and making several bunchs. the handiness could be increased proportionately. However. there are findings that show that High Availability decreases when there are more constituents that are added to the system. This means that alternatively of bettering the procedure it is alternatively undermined by the installing of extra constituents. The ground for this. harmonizing to Chee-Wei Ang. is that the more complex a system the more possible failures arise ( Ang 2007 ) .

Since there are more systems to supervise. it becomes more hard to indicate out precisely where the job is. This can be compared to a complicated plumbing system wherein it becomes hard to happen the beginning of the leak. Though it has been argued by experts that a figure of extremely available systems utilize a simple design architecture which features high quality multipurpose systems. Yet even with this. it can non disregard the basic fact that theses systems still require changeless upgrading. patching and care.

The recent developments in this field include the creative activity of more advanced systems designs that streamline and ease the care of systems without the demand for compromising the handiness. This has been achieved by making burden reconciliation and more advanced failover techniques. It is admitted. nevertheless. that while there are several developments. like all hardware devices these systems are besides prone to human mistake and typical wear and rupture which can non be avoided though their effects can be mitigated by the debut of more effectual and efficient agencies.

Related essay samples:

  1. Windows 2008 Network Services Essay
  2. Introduction About Microsoft Exchange Server 2010 Information Technology Essay
  3. Introduction About Microsoft Exchange Server 2010 Information Technology Essay
  4. Ethical Hacking Essay
  5. Examining The Different Types Of Information Ethics Information Technology Essay
  6. Management: Paying for patching Essay
  7. MAC-vs-PC
  8. Perform a Byte-Level Computer Audit Essay
  9. Comparison between centralized and distributed DBMS
  10. Comparison between centralized and distributed DBMS
  11. Group Support Systems Essay
  12. Computer Science Essay Research Paper Computer science
  13. How To Set Up Remote Desktop Information Technology Essay
  14. Google docs
  15. Computers Essay