What is EBS [Elastic Block Storage]: EBS is block-level storage device that you can attach to your instances. After you attach to instance you can use as a physical hard drive. EBS storage flexible you can increases or decrease size, IOPS and types easily.
Types: According to price, performance and characteristics they are divided in 5 types.
- General Purpose SSD gp2
- Provisioned IOPS
- Throughput Optimized HDD
- Cold HDD
- Magnetic
Snapshot of EBS: We can take snapshot of EBS and attached it to another Instance for data transfer as well. Also we can take incremental snapshot of EBS volume like as follow.
- In the diagram below, Volume 1 is shown at three points in time. A snapshot is taken of each of these three volume states
- In State 1, the volume has 10 GiB of data. Because Snap A is the first snapshot taken of the volume, the entire 10 GiB of data must be copied
- In State 2, the volume still contains 10 GiB of data, but 4 GiB have changed. Snap B needs to copy and store only the 4 GiB that changed after Snap A was taken. The other 6 GiB of unchanged data, which are already copied and stored in Snap A, are referenced by Snap B rather than (again) copied. This is indicated by the dashed arrow
- In State 3, 2 GiB of data have been added to the volume, for a total of 12 GiB. Snap C needs to copy the 2 GiB that were added after Snap B was taken. As shown by the dashed arrows, Snap C also references 4 GiB of data stored in Snap B, and 6 GiB of data stored in Snap A
- The total storage required for the three snapshots is 16 GiB
Extending or Reducing Volume: We can change size of EBS volume from EC2. Once you modified you need to modify in disk management that depend on guest Operating system.
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