- When the cloud is available in all the regions - Public Cloud
- When the cloud is only available or limited to organization or a region, it is known as Private Cloud
- DR = Disaster and Recovery
- Minimizes the downtime by keeping the clouds in different regions
- why we use cloud
- advantages vs dis of cloud
- why we use replicate
- replicate should be outside the province (DR)
- what is AWS
- In centralized system, if network chokes or an issue occurs, all the users will be idle and user will not be able to access
- Whereas, in distributed, every user is independent.
- E.g, large database can be hosted in different locations which will prevent network congestion and provide load balancing
- H-A = High Availability Cluster
- DC consists of different tiers, which includes, tier 1, tier 2, tier, tier 4
- Tier 4 - Full replicate of everything
- Tier 3 - Double replicate of hardware, e.g, two hard drives.
- difference betweem parellel and distributer why we use and when to use them - 8-10 seconds to boot up
- Tier 2 - Whatever the hardware is available - 10 minutes time to boot up
- Tier 1 - Every server has multiple power supply
- Robust Test - Lowest latency
- Security - Encryption
- Security is most important in distributed
- hot swappable - when hard drive can be replaced without any downtime, that is also called size transparency
- data writing and reading - if they are at same time, then writing will have more priority than reading to prevent the
- data loss
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