Green Computing Green computing or green IT is “The study and practice of designing, manufacturing, using, and disposing of computers, servers, and associated subsystems—such as monitors, printers, storage devices, and networking and communications systems—efficiently and effectively with minimal or no impact on the environment.The two main goals:• Reduction in cost.• Energy efficiency.
Thin Client:- A thin client can refer toeither a software program or to anactual computer that relies heavily onanother computer to do most of itswork.
Thin Client System Consists of multiple heterogeneousworkstations connected to a single server. Diskless work Old PC New PC station
Thin Client System Thin Client SystemHardware requirement of a Thin Client is :Keyboard, monitor, mouse and somecomputation power.
Thin Client System Thin Client System ServerServer performs all application processingand stores all the user’s data
Thin Client System Keyboard and mouse inputThin Client System Communication protocol Server Screen updatesThin Client and Server communicatesusing a display protocol such as X or RDP
Hardware RequirementServer (Minimum) Client• Pentium III or above • Normal PC• 512 MB RAM • Pentium class or above• Display card • Network card with PXE• Network card • Without hard disk drive• 20GB ATA-100• 14” Monitor• Keyboard and Mouse• Floppy drive• CD-ROM drive• UPS
Network Requirement• 100 Mbps Switch hub• UTP cable• Modem or ADSL to connect to internet• For ADSL modem, server need another additional NIC
Software RequirementServer Client• Linux OS• X Windows (KDE/GNOME) • Office suite applications• DHCP service • Web browser• TFTP service • E-mail & news reader• NFS service • Graphics applications• Thin client software • Multimedia applications• Printer service (optional)• • Games applications Firewall service (optional)• Backup data service (optional)• Proxy service (optional)• DNS service (optional)• UPS service (optional)
How a Thin Client works:-• A thin client can be a low-powered PC a terminal that boots and downloads it’s os from a boot server or other embedded os.• Remote Computation Server Takes Care Of All The Processing.• Individual sessions or virtual machines are created on the server for multiple access.• Works On either Citrix`s ICA Or Microsofts RDP Protocols (Both Require Only 20Kbps Speed Over Network To Work).
1. Mainframe 2. Personal Computer3. PC Workstation/Server 4. Thin Client
Thin Client’s relation with cloud or grid computing:-• Thin clients• Grid computing• Utility computing
Characteristics:- • Single point of failure • Cheap client hardware • Client simplicity • Thin client security
List of protocols used with thin clients:- • Appliance Link Protocol • Citrix ICA • NX technology • PCoverIP • Remote Desktop Protocol • GO-Global RXP • HPs Remote Graphics Software • Secure Shell or SSH, an encrypted replacement for telnet. • SPICE (Simple Protocol For Independent Computing Environments) • Virtual Network Computing • X11, central to Unix windowing • XML, HTML, or JSON over HTTP (Ajax)
Trends in Thin Client computing:-• Few years ago low-powered desktop clients within a local network were used.• Recent trends obtain information from ASP’S.• Walk up browsing stations are developed .
Recent trends:-Ultra Thin Clients:• A sun Microsystems stateless S270 thin client is called an ultra thin client or a zero client.• Kernel initializes the network, begins networking and handles display of server’s output.
Recent trends:-Web Thin Clients:• Moderro Xpack web-centric thin clients.• Rely on Web-based software.• High security.
Applications:-• Used in hospitals ,educational system’s , internet cafes and libraries and home user’s.• Acts as remote accessing solution for companies.• client-side technologies like Ajax and Flash makes it more compatible.
Components of Thin Client computing:-Thin Client Hardware:• The windows-based terminal.• Network pc.• Network computer.• Wireless tablet.• Fat client.
Components of Thin Client computing:- • Thin client software. • Network connectivity. • The host server.
Components of Thin Client computing:-Thin Client protocols:• The Remote Desktop Protocol.• The Independent Computing Architecture Protocol.• The X Protocol.
Advantages:-• Decreases IT Cost By 80% Through Reduced Staff And Centralized Software Management.• Increased Life Time Of Client.• Eliminates The Hardware Upgrades On Client Side, Reduced Power Consumption, Centralized Backup.• No Access To HDD, FDD, CD-ROMS.• Thin Clients Are Virus Proof. (Since No OS And HDD Resides On It)• Fast and less installation work – Install only at one computer• Less maintenance – Fast and less administrative work• Ease of use – User interface similar to current OS• Reduce cost for hard disk failure – no hard disk drive for client
Disadvantages:-• Server cost is high, requires more band width.• Services like Streaming Video, Video Games, DVD Movies aren’t supported in all version.• Multimedia and project based applications run very slow.• Widely effected by reduction in the cost of PC’s.• Less knowledge on open source software
Conclusion:-• Common PC skill would be enough to manages the whole network, extends life of PC’s by 2- 3years and reduces Base Line Support costs over 3 to 5 years.• Thin client system can be deploy to all sector• Web base applications better to support multiplatform “Thin Client is a primitive of Green Computing”
References:-.http://en.wikipedia.org/wiki/Thin_client.http://www.thinclients.co.in/.http://www.search.com/reference/Thin_cli ent.http://en.wikipedia.org/wiki/cloud_comput ing