Cost Optimization - Storage

Question 1

S3 - Characteristics

Answer 1

• Use lifecycle rules to transition objects between classes and expired objects
• Use caching to avoid unnecessary downloads, and reduce S3 costs
• Lifecycle rules can be configured to abort all multipart uploads that are failing to complete in a specific time period

Question 2

S3 - Standard and One Zone cost

Answer 2

• It’s applied at object level. A bucket can store objects of different classes
• Fees apply per GB storage and retrieval
• Standard: the most expensive class for storage. The least expensive for data retrieval, as Intelligent-tiering
• Standard IA: less expensive than Standard for storage. More expensive than Standard for data retrieval, as One Zone IA
• One Zone IA: less expensive than Standard IA for storage. More expensive than Standard for data retrieval, as Standard IA

Question 3

S3 - Intelligent-tiering cost

Answer 3

• Provides four sub-tiers: Frequent Access, Infrequent Access, Archive Access, and Deep Archive access
• Data storage cost: FA-tier cost the same as Standard. IA-tier cost the same as Standard IA. Archive cost the same as Glacier. Deep Archive cost the same as Glacier Deep Archive
• Retrieval cost: the same as Standard, but has an additional cost for lifecycle transition request

Question 4

S3 - Glacier and Glacier Deep Archive cost

Answer 4

• Glacier: less expensive than One Zone IA for storage. More expensive than One Zone IA for data retrieval
• Glacier Deep Archive: the least expensive for storage. The most expensive for data retrieval

Question 5

EBS - Considerations

Answer 5

• Define the proper storage for your workload
• Delete EBS volumes that are no longer required. For example delete non-root volumes after deleting an EC2 instance
• Monitor EBS storage with CloudWatch

Question 6

EBS - EBS Volumes cost

Answer 6

• HDD: throughput optimized HDD and cold HDD are priced by storage only
• SSD:
• General purpose SSD are charged by three things: per GB saved, IOPS per month, and MB/s per month (throughput). Less expensive than Provisioned IOPS
• Provisioned IOPS SSD are charged by two things: per GB saved, and IOPS per month. More expensive than General Purpose