EBS Snapshots are point –in-time
Image/Copies of your EBS volumes. EBS volumes are AZ specific and Snapshot are
region specific.Any data written to the volume
after the snapshot process is initiated will NOT be included in the resulting
snapshot (but will be included in future incremental updates).
EBS snapshots are stored on S3, however you cannot access them directly, and you can only access them through EC2 APIs.We can create or restore a snapshot to an EBS volume of the same or larger size than the original volume size, from which the snapshot was initially created and we can NOT restore an EBS volumes snapshot to a smaller volume size.
EBS snapshots are stored on S3, however you cannot access them directly, and you can only access them through EC2 APIs.We can create or restore a snapshot to an EBS volume of the same or larger size than the original volume size, from which the snapshot was initially created and we can NOT restore an EBS volumes snapshot to a smaller volume size.
We can take a snapshot of a non-root EBS volume while the volume is in use on a running EC2 instance. But for a root (boot) EBS volume, you should (recommended) stop the instance first and then take the snapshot.
Snapshot will only include data that is already written to your volume, Any data cached by OS or in memory will not be included which means snapshot is not 100% consistent.Snapshot completion time depends upon the data size of volumes for which snapshot is taken, It stay in pending state until the full snapshot is completed after which statues changes to complete.
- We can still access the volume while snapshot is getting completed but the I/O might be slow. For consistent snapshot you need to stop I/O’s or un-mount the volume if possible (or stop the instance for root volumes). We can re-mount the volumes while the snapshot status is in pending.
- EBS snapshot are stored incrementally and are created asynchronously.
- Deleting a snapshot of a volume has no effect on the volume and Deleting a volume has no effect on the snapshot made from it.
- AWS charges for S3 storage and data transfer to S3 from your EBS volume you are taking snapshot.
Refrence: Read it (Amazon)
Hope this was informative!!!
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