S3 Object Storage Classes Flashcards
At which moment can you choose a Storage Class in S3?
During object upload
What is the default Storage Class in S3?
S3 Standard
Can you change the class of an object once it was already uploaded?
Yes, it is easy but some conditions need to be met
What level of resilience does the S3 Standard Storage class have?
Regional resilience
Can the S3 Standard class tolerate the failure of an AZ?
Yes, because it is regionally resilient
How does the S3 Standard mode achieve regional resilience?
By replicating the objects in at least 3 AZs
How much % of durability does the S3 Standard class have?
11 9’s
How much % of availability does the S3 Standard class have?
4 9’s
How much % of SLAdoes the S3 Standard class have?
3 9’s
What happens if S3 breaches some SLAs?
AWS will give you some discounts.
What are the benefits of using S3 Standard?
Low latency and high throughput
What is the S3 Standard class billed for?
- Data storage: GB/month fee
- Transfer OUT of data: $ per GB
- Price per 1000 requests
- No retrieval fee, no minimum duration, no minimum size
Main UC for using S3 Standard Class?
Frequently accessed data which is important and non-replaceable.
How much cheaper is to use the S3 Standard-IA class than S3 Standard?
Approx. 54% cheaper
Is there any minimum size that each object will be charged for when using S3 Standard-IA (even when it is smaller)?
128 KB. For smaller objects, you might end up paying much more money.
Is there any minimum duration of storage that will be billed when using S3 Standard-IA
30 days minimum duration charge (even if you store the object for 1 day).
Is there any retrieval fee when using Standard-IA?
Yes, it is charged per GB and it is normally small.
Main UCs for using S3 Standard-IA
- Rapid and less frequent access.
Data rarely needed but immediately. - Long term storage like DR files
When is it not recommended to use S3 Standard-IA?
When data is constantly accessed.
When data can be easily replaced.
When data is tiny (because of the 128KB minimum fee)
Main UCs for using S3 One Zone-IA
- Secondary copies of primary data or backup copies.
- Replaceable data accessed less frequently but quickly
how much cheaper than S3 Standard IA is S3 Zone-IA?
Around 80% of the base cost of standard-IA
Is there any minimum size that each object will be charged for when using S3 One Zone-IA (even when it is smaller)?
128 KB
How much % of availability does the S3 Standard-IA class have?
3 9’s
How much % of SLAs does the S3 Standard-IA class have?
3 9’s
How much % of availability does the S3 One Zone-IA class have?
99.5%
Can the S3 One Zone-IA class stand an AZ failure?
No. The data is not replicated to other AZs.
Can you retrieve immediately objects from S3 Glacier storage?
No, the retrieval can take minutes or hours.
How many retrieval modes exist when using S3 Glacier?
- Expedited (1-5 minutes) - the most expensive
- Standard (3-5 hours)
- Bulk (5-12 hours) - lowest cost
Which retrieval method would you use in S3 Glacier storage for a large set of data?
Bulk.
how much cheaper than S3 Standard is S3 Glacier?
17% of the base cost of S3 standard
3 main characteristics of S3 Glacier?
Secure, durable and low cost for archival data.
Does data get replicated when using S3 glacier?
Yes, to 3+ AZs
Is there a minimum storage duration for S3 Glacier?
Yes, 90 days
Is there a minimum object charge for S3 glacier?
40 KB.
UC for using S3 Glacier Storage class
Data that does not require immediate access and it is not frequently accessed.
For what is S3 Glacier Deep Archive designed for?
Designed for long term backups and as a tape-drive replacement`
How much cheaper than S3 Standard is S3 Glacier Deep Archive?
4.3% of the base cost of S3 Standard
Is there a minimum storage duration for S3 Glacier Deep Archive?
180 days
How many retrieval modes are available in S3 Glacier Deep Archive?
- Standard - within 12 hours
- Bulk - within 48 hours (cheaper)
Can a S3 Glacier Deep Archive object be made public or be downloaded normally?
No, due to the high retrieval time.
Name the most common UCs for S3 Glacier Deep Archive
- Any case when data needs to be accessed very rarely or never.
- Finance
- Health care: medical records, x-rays
- Media: media archives, 8k productions
- Physical security: cameras, footage
- Scientific data surveys or research sets
- For regulatory purposes when you are forced to store some data for X time.
What does the S3 Intelligent-tiering class do?
It combines Standard and Standard IA classes.
It uses automation to remove the overhead of moving objects from one tier to another one.
How often will an object be moved to Standard IA tier when using S3 Intelligent-tiering class?
After 30 days from the last access
Does S3 Intelligent-tiering have retrieval charges?
No
Does S3 Intelligent-tiering have any additional fee?
Yes, 0.0025$ per 1000 objects tracked (for monitoring and automation)
Does S3 Intelligent-tiering have a minimum storage duration?
Yes. 30 days.
Name some UC of S3 Intelligent-tiering
Good for long-lived data with changing or unknown access patterns.
