Storage Flashcards
What persistent storage is typically used for EC2 instances?
EBS, Elastic Block Store
What are the characteristics of EBS?
EBS is persistent, network attached storage which is replicated within an AZ for redundancy. it can be encrypted, and backed up. EBS volumes can be detached from EC2 instances and re-attached elsewhere.
How do you achieve redundancy of data with EBS?
EBS automatically replicates all data to multiple locations in an AZ
What ephemeral storage is typically used for EC2 instances?
Instance backed volumes.
What are the characteristics of instance backed volumes?
They are attached to an EC2 instance. When the EC2 instance is stopped, all data is lost. Data will remain through a reboot.
What is the cost of data transfers related to S3?
Data transferred into S3 is free, data transferred between regions is $0.02 / GB
What is the cost of requests with S3?
$0.053 / 10,000 operations that change data
$0.042 / 10,000 GET operations
What 4 types of data should you NOT use S3 for?
1) long term data archiving
2) Fast changing data
3) File systems
4) Structured data that must be queried
What are S3 ACL’s used for?
Controlling access from the public, from outside of your AWS account
How do you control rights for S3 objects from within your account?
Bucket policies
What is the default limit on the number of S3 buckets you can have within an account?
100 - soft limit
What are the data retrieval options for Glacier?
1) Expedited, for < 250 MB, available in 1 - 5 minutes
2) Standard, available in 3 - 5 hours
3) Bulk, available in 5 - 12 hours
What is the difference between Glacier Vault Access Policies and Lock Policies?
Vault access policies are editable, and expected to change over time. Lock policies cannot be changed once they are set, and are used for regulatory compliance
What is the cost of data transfers related to Glacier?
Data transfers into Glacier is free. Data transferred to another region is $0.02 / GB. Data transfers to the internet depends on the amount of data.
What is a good general rule for when to use Snowball?
If your data would take more than a week to transfer over your network connectivity to AWS, consider Snowball
What sizes does the Snowball come in?
50 TB and 80 TB, but 50TB is only available in the US
What are the 3 configurations of the Storage Gateway?
File, Volume, and Tape
What are the two configurations of the Storage Gateway’s Volume Gateway?
Stored and Cached
What is the primary use case for a Stored Volume Gateway?
Backing up to AWS, then during a disaster of the traditional DC, bringing the systems online in AWS. The backups are stored as EBS snapshots and can be attached to EC2 instances
What is the primary difference between a Stored Volume Gateway and a Cached Volume Gateway?
The stored treats local storage as the primary and backs up to AWS, while the cached treats AWS as the primary and uses a local cache to buffer the transfers
What is the Taped Library configuration of the Storage Gateway?
The storage gateway replaces a physical tape library solution with virtual tapes which actually back up to AWS
What are the 4 primary security controls for S3?
Bucket policies, ACLs, Data Encryption, SSL
What are the two performance modes of EFS?
General Purpose and Max I/O
What are the 2 primary types of EBS volumes, and their individual subtypes?
SSD, and HDD. SSD has General Purpose and Provisioned IOPS, while HDD has Cold HDD and Throughput optimized HDD.
