6 mis-availability
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Ridi Ferdiana | [email protected] Version 1.0.0
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Availability is the process of optimizing the readiness of information systems by accurately measuring, analyzing, and reducing outages to information systems.
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Similarity
Measured by time in 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.
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Data Center Facility
Server Hardware
Server System
Software
Application Software
Disk Hardware
Database Software
Network Software
Network Hardware
Desktop Software
Desktop Hardware
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Slow response refers to 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.
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High availability refers to 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
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Hig
h A
vailib
ility
Fault Tollerant
Availability
Up Up
Redudancy Redudancy
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Percent Availability = (Hours Agreed Up - Hours Down)/Hours Agreed Up
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Budget limitations
Component failures
Faulty code
Human error
Flawed design
Natural disasters
Unforeseen business shifts (such as mergers, downturns, political changes)
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Redundancy Power supplies
Multiple processors
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
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Reputation Percent market share
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
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Learning the key terms : 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