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18 Cards in this Set
- Front
- Back
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3 types of replication for Durable database storage |
1. Synchronous Replication 2. Asynchronous Replication 3. Quorum based Replication |
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Two types of Redundancy |
Standby Redundancy Active Redundancy |
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What is Standby Redundancy |
Secondary resource is launched only when needed or running idle (to improve speed of recovery) |
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Example where standby redundancy can be used |
Stateful components like relational databases |
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What is failover? |
When a resource fails, failover is the recovery of functionality using a secondary resource |
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What is active redundancy? |
Requests are directed to multiple redundant resources. |
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ElasticSearch and CloudSearch - How do they scale horizontally? |
Data Partitioning an Replication |
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5 strategies in removing single point of failure |
Redundancy, Detecting Failures, Durable Data Storage, Automated Multi-Data Center Resilience |
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Amazon services designed with Multi-AZ principle |
S3 RDS DynamoDB |
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Shuffle Sharding? |
Distribute each customer to a sharded service (say EC2 instance) |
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Services which dont require capacity decisions (good savings) |
ELB, CloudFront SQS Kinesis Firehose, Lambda, SES, CloudSearch |
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What is Storage Gateway |
VM to be downloaded and activated which enables AWS storage to be accessible as locally as iSCSI volumes. |
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Two modes of storage in Storage Gateway |
- Gateway Cached - Gateway Stored |
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What is Gateway Cached mode? |
Primary storage in S3. Only recent files are stored locally. |
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What is Gateway Storage mode? |
All data stored locally but asynchronously backed up to S3. Max size is 1 TB. |
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Max data in Storage Gateway in Cached Mode |
32 TB. |
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Max data in Storage Gateway in Storage Mode |
1 TB |
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4 Components in Storage Gateway pricing |
- per gateway per month - snapshot storage usage - volume storage usage - data transfer out |
