Storage

Question 1

What are the max file size in S3

What does naming look like in S3

Answer 1

• Files can be from 0 - 5TB
• Practically unlimited storage
• S3 has universal namespace.
  
  • The reason for that is that it creates a unique URL

Question 2

What is Subresource in S3

Answer 2

• Access Control List (ACL)
• Torrent

Question 3

S3 Consistency

Answer 3

• Read After Write - PUT
• Eventual Consistency - Overwrites and Deletes

Question 4

S3 Availability and Durability

Answer 4

• Availability - 99.9% (Build for 99.99%)
• Durability - 11 9’s

Question 5

S3 Tired Storage Available

Answer 5

Cost based on.

• Storage
• Request and Data retrievals
• Data transfer
• management and replication

Questions will be mostly around storage size.

Question 6

S3 Lifecycle Management

Answer 6

Management → lifecycle rule

Question 7

S3 Versioning

How does versioning lifecyle work? What is delete marker ?

Answer 7

• creates version even for deletes
• versioning cannot be disabled once enabled, it can only be suspended
• If each and every file needs to be public, we need to make each and everyone public one by one
• Delete the delete marker will make the object available.
• If we permanently delete the each version, then it will go for good
• This is required for replication as well
  
  • ​Replication works only for files after the replication is turned on.
  • Delete markers are not replicated.

Question 8

S3 MFA DELETE

Question 9

S3 ACL

Answer 9

This applies to all the objects in the buckets. There are access logs created for logging the access to the objects. The logs storage bucket can be stored in another s3 bucket as well.

Question 10

S3 BUCKET POLICIES

Question 11

S3 STORAGE CLASSES

Answer 11

• S3 STANDARD
• S3 - IA ( Infrequently accessed)
  
  • Charged retrieval fee
• S3 One Zone - IA
  
  • In one AZ
• S3 Intelligent Tiering
  
  • Using machine learning
  • Move around between S3 standard and S3-1A
• S3 Glacier
  
  • Comparable cost to that of on-premise datastore
  • configurable from minutes to hours
• S3 Glacier deep storage
  
  • Cheapest
  • 12 hour min retrieval time.

Question 12

S3 Cost

Answer 12

• Cross-Region Replication
  
  • Across region for DR and High Availability
• Data Transfer Pricing
• Transfer Acceleration
  
  • Take advantage to CloudFront to accelerate and secure download.

Cost based on.

• Storage
• Request and Data retrievals
• Data transfer
• management and replication

Questions will be mostly around storage size.

Question 13

S3 Encryption

Answer 13

• S3 managed keys for encryption (SSE -S3)
• SSE -KMS
• Server Side encryption with SSE-C
• Encryption can be enforced using bucket policy

Question 14

S3 Object Lock

Answer 14

• Write Once and Read Indefinitely (WORM)
  
  • Regulatory requirements
• Governance Mode
  
  • Special permissions - users
• Compliance Mode
  
  • Objects cannot be deleted or overwritten including the root user.
• Retention period - Object cannot be deleted
• Legal Hold - No period attached, but cannot be deleted or
  
  • s3:putlegalhold
• S3 Glacier Vault Lock
  
  • Controls can be specified in a policy and policy can be locked.

Question 15

How can we quickly retrieve data from glacier ?

TODO: Read up a bit/ also vault policy so on.

Answer 15

• Expedited retrieval

Question 16

S3 get specific bytes

Answer 16

Use the range header in the http request.