Storage and Databases Flashcards
How do block-level storage volumes work?
Like a physical hard drive
What provides temporary block-level storage for an Amazon EC2 instance?
An instance store
What happens to the data in an instance store if you terminate the attached EC2 instance?
The data is deleted.
What service maintains an instance store even after the attached EC2 instance terminates?
Amazon Elastic Block Service (EBS) stores data on a separate drive from the host of the EC2 instance.
How do you back up data in an Amazon EBS volume?
Amazon EBS Snapshots back up data incrementally, first backing up everything and then only backing up changed data.
What three things make up an object in object storage?
Data, metadata, and key
What’s an important difference between block storage and object storage?
Block storage is incremental, only updating pieces that change. Object storage is total, updating the entire object when any piece changes.
What service provides object-level storage?
Amazon Simple Storage Service (S3)
What kind of data goes in S3 Standard storage? And how many Availability Zones does it use?
Designed for frequently accessed data, stored in three Availability Zones minimum.
What’s a key characteristic of S3 Standard-Infrequent Access (S3 Standard-IA)
For INfrequently accessed data, it has a lower storage price and a higher retrieval price. Stored in three Availability Zones minimum.
What’s a key characteristic of S3 One Zone-Infrequent Access (S3 One Zone-IA)?
Stores data in a single Availability Zone. Saves costs, but you need to be able to reproduce the data if that Availability Zone fails.
What’s a key characteristic of S3 Intelligent-Tiering?
Data that has unknown or changing access patterns. Has a monthly monitoring and automation fee per object. Automatically moves an object to IA if not accessed for 30 days. If accessed, moves to S3 Standard.
What’s the difference between S3 Glacier Instant Retrieval, Flexible Retrieval, and Deep Archive?
Instant Retrieval allows immediate access. Flexible Retrieval takes minutes to hours to retrieve, but costs less. Deep Archive takes up to 12 hours, and is least expensive.
What separates file storage from block storage and object storage?
File storage IS block storage, but using a local file system to organize files. File storage is for use cases where a large number of services and resources need to access the same data at the same time.
What service provides file storage?
Amazon Elastic File Storage (EFS)
