AWS Classroomnotes 19/Apr/2023

AWS Disk Storages

Amazon Elastic Block Storage

• This is a service that offers a persistent storage for ec2 instances.
• EBS has to be os disk in AWS
• EBS will be from the same zone in a region where ec2 is launched
• EBS is physically located in different server in the same zone where ec2 is launched where as instance store comes from the same physical location
• Instance store is supported only by few instance types
• AWS uses a term called as volume to represent disk
• root volume is disk with os which has to be EBS
  
• EBS can be attached to only one ec2 instance at any given moment
• Backups of EBS volumes are called as snapshots
• Snapshots can be taken manually or AWS Backup service can automatically take backups according to schedules
• EBS Volumes types
  • General Purpose SSD:
    • IOPS: 100 to 16,000 IOPS
    • good performace at low cost
  • Provisioned IOPS SSD:
    • IOPS: 100 to 100000 iops
    • Size to IOPS ratio has to be between (1:50)
  • HDD-Backed Volume
  • Throughput Optimized HDD
  • ColdHDD
    
• AWS can provide
  • empty disks to EC2
  • disks from snapshots to EC2
• EC2 disk sizes can be increased, but not decreased

Amazon Elastic File Share

• Fully managed file share which can be mounted to multiple linux instances
• This is storage from network, so it comes with security group
• Performance Mode:
  • General Purpose
  • Max I/O Mode
• EFS cannot be mounted as os disk, where as can be mounted on any other disk.

Experiments

• Create two ubuntu ec2 instances in any region
  
  
  
• Make a note of volumes created
  
• Create a snapshot of volume
  
  
  
• From snapshot create a new volume in different AZ
  
  
  
  
• From snapshot create a new volume in different Region
  • Select Snapshot
  • Copy snapshot to any region
  • from there create ebs volume
    
    

Next Steps

• Create a new empty volume (Size 1 GB)
• Mount this to one ec2 instance
• Create a xfs based file system
• Restart the machine
• See what are mounts attached.