Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

If you make periodic snapshots of a volume, the snapshots are incremental so that only the blocks on the device that have changed since your last snapshot are incrementally saved in the new snapshot. Even though snapshots are saved incrementally, the snapshot deletion process is designed so that you need to retain only the most recent snapshot in order to restore the volume.

http://docs.amazonwebservices.com/AWSEC2/latest/APIReference/ApiReference-query-DeleteSnapshot.html

How to understand, which of snapshots I can remove? Can I remove any? Can I remove first?

share|improve this question

1 Answer 1

Well, the text you qouted is hard to mis-understand: You can delete all snapshots up the newest and will be able to restore your volume from it.

So, if you have 10 snapshots s1 to s10, you can delete all up to s9. If you keep s9 and delete s10, you will only be able to recover to the state the system was at s9.

share|improve this answer
    
How that can be possible? In a moment of deletion, snapshots merged? –  dynback.com Jan 16 '12 at 10:54
1  
It's theoretically easy, yet difficult to explain. Please see en.wikipedia.org/wiki/Snapshot_%28computer_storage%29 and the articles linked there for an explanation. –  SvW Jan 16 '12 at 11:29

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.