Grooming Classroomnotes 07/Mar/2023

Types of Applications – Based on Who is maintaining and installing

• Overview
  
• Organizations are responsible for
  • installing and maintaining servers
  • maintaining Standalone applications
• Users install standalone applications

How organizations maintain Servers

• Organizations maintain Datacenters
• Datacenters will have multiple racks
• Each rack will get parallel power supply and parallel network connection, reason for this is failures should not be propogated.
  
• Server racks contain blade servers
  

Running applications on Servers

• Generation 1: Running applications directly on physical server
  • Install some OS (Server OS)
  • Install applications on top of it
  • Problems:
    • ROI (Return on Investement) is very time taking and long
  • Costs:
    • Capex (Capital expenditure)
    • Opex (Operational Expenditure)
      
• Generation 2: Hypervisors became popular
  • Hypervisor has two flavors
    • Install directly on physical servers
      
    • Install on existing os in physical server