Mainframe Computer - Redbrick

actionflashlightElectronics - Devices

Nov 7, 2013 (4 years and 1 month ago)

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Computer Hardware Types
 Embedded
 PDAs
 Handheld
 Netbooks
 Notebooks
 Laptops
 Tablet
 Ultra-mobile PCs
 Desktops
 Servers
 Mainframes
 Clusters
 High-end machines
PDA
 Personal Digital Assistant
 Flash memory instead of hard disk
 No keyboard, use touchscreen technology instead
 Very lightweight, reasonable batterylife
 Features
 Appointment calendar
 To-do list
 Address book
 Calculator
 Memo
 Email client, web browser
 Data synchronisation
 Ruggedised PDAs
 Enterprise Digital Assistant (EDA)
 Extra features (e.g. barcode readers)
 Examples
 Blackberry
 iPhone (?)
Laptop Computers
 PC for mobile use, small and light enough for ones lap
 Integrates components
 Screen, keyboard, mouse, speakers, rechargeable bat tery
 Size (generally)
 Thickness: 18  38 mm (0.7  1.5 in)
 Screen: 27 x 22 cm (10x8 in) 13  39 x 28 cm (15x11 in) 17
 Weight: 1.4  5.4 kg (3  13 pounds)
 Form factor:
 Flip form: protect screen and keyboard when closed
 Tablet: display can swivel, touchscreen display
 Types
 Desktop replacement: performance and larger screen
 Standard laptop: portability
 Subnotebook: portability, less features
 Advantages (vs desktops)
 Portability
 Size
 Ease of access
 Low power consumption
 Quiet
 Battery (no need for UPS)
 All-in-one
Desktop Computers
 PC for regular use at a single location
 Different forms:
 Tower cases (under desk)
 Horizontally-oriented computer case (monitor on to p)
 Small form factor (behind monitor)
 All-in-one
 Monitor and CPU in same case
 Early PCs, iMac
 Advantages (vs laptops)
 Performance (cheaper than laptops)
 Spare parts and extensions are standardised (cheape r, wildly available)
 (dis)assembly relatively easy
 Power consumption not as critical (wall socket, not battery)
 More space for heat dissipation
 Better ergonomics
 Durable
 More secure
Workstation
 High-end PC
 Technical or scientific applications
 One user, connected to local area network
(LAN)
 Run multi-user Operating Systems (OS)
 Features:
 multiple multi-core CPUs
 Error correcting memory
 Large on-die caches
 historically Unix OS, some Windows based
 Some Workstations designed for specific
purpose
 E.g. AutoCAD
Mainframe Computer
 Used by large organisations for critical
applications
 Bulk data processing (census)
 Financial transaction processing
 Aka Enterprise server
 High-end commercial machines
 IBM System/360 line (z10 is the latest)
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Mainframe Computer
 Features:
 Computation speed
 Redundant internal engineering
 High reliability and security
 Extensive I/O facilities
 Backward compatibility
 High utilisation rates/massive throughput
 Repairs and h/w upgrades during normal operation
 Run multiple OSs
 High level of online data storage (quick access)
Server Computer
 Provides essential services across a
network
 Private users inside a large organisation
 Public users in the internet
 Can have dedicated functionality
 Web server, print server, database server
 Features;
 Very fault tolerant (e.g. stock exchange)
Cluster
 Group of linked computers, working
closely together
 Often connected via fast LANs
 Improve performance/availability
 Types:
 High-availability (HA)
 Load-balancing
 Compute
Supercomputer
 Leading-edge processing capacity (especially speed of
calculation)
 One-of-a-kind custom design
 Cray, IBM, Hewlett-Packard
 Uses: Calculation intensive tasks
 Quantum mechanical physics, weather forecasting, p hysical
simulations
 Grand Challenge problems (semi-infinite computing resources
required)
 Features:
 Innovative designs for parallelisation
 Careful memory hierarchy design
 Support high bandwidth
 Eliminate s/w serialisation
 Use h/w to address bottlenecks
 Cooling an issue
Others
 Wearable computers