6 mis-availability

6 mis-availability

• 1.
  Ridi Ferdiana |[email protected] Version 1.0.0
• 2.
  Availability is theprocess of optimizing the readiness of information systems by accurately measuring, analyzing, and reducing outages to information systems.
• 3.
  Similarity Measured by timein a year / month The difference Uptime is a measure of the time that individual components within a production system are functionally operating Availability focuses on the production system as a whole.
• 4.
  Data Center Facility Server Hardware Server System Software Application Software Disk Hardware Database Software Network Software Network Hardware Desktop Software Desktop Hardware
• 5.
  Slow response refersto unacceptably long periods of time for an online transaction to complete processing and return results to the user Downtime refers to the total inoperability of a hardware device, a software routine, or some other critical component of a system that results in the outage of a production application.
• 6.
  High availability refersto the design of a production environment such that all single points of failure are removed through redundancy to eliminate production outages Fault tolerant refers to a production environment in which all hardware and software components are duplicated such that they can automatically failover to their backup component in the event of a fault
• 7.
  HighAvailibility Fault Tollerant Availability Up Up RedudancyRedudancy
• 9.
  Percent Availability =(Hours Agreed Up - Hours Down)/Hours Agreed Up
• 10.
  Budget limitations Component failures Faultycode Human error Flawed design Natural disasters Unforeseen business shifts (such as mergers, downturns, political changes)
• 11.
  Redundancy Power supplies Multipleprocessors Segmented memory Redundant disks Reliability Logs Management Feedback Analyst Recoverability Network Avail. System Restart System Switch Over Repairability MTBF = sampling interval / # of failures during sampling interval MTTR = sum of repair times / # of failures
• 13.
  Reputation Percent marketshare Industrial comment Publication Review Track records Customer Reference Responsiveness In house support Recovery disk Well trained user Robustness Technical changes: Platform, Product, Services, Customer Personal changes: Turnover, Expansion, Rotation Business changes: New direction, Acquisitions, Merger
• 17.
  Learning the keyterms : Availability, Up Time, Fault Tolerant, and High Availability 10 key components of high availability Key skills that needed to handle the IS Availability Measuring Availability from SLA High Availability Limitation 7 Rs of Availability Assesing Availability