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Any storage consumption differences with different Encryption types?

  • 10 May 2024
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IHAC who wants to change from 3DES encryption to AES-256. I know we don’t re-encrypted data that already exists in the library, but the question is do we see a noticeable difference in storage consumption between ciphers? We list performance ratings here, but do any of them have a higher or lower storage consumption penalty?

https://documentation.commvault.com/2023e/expert/supported_algorithms_for_software_encryption.html

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Best answer by Albert Williams 13 May 2024, 05:31

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Hello @Matt Jaquillard 

Encryption will have no impact on our Deduplication as the data is handled in the following way: 
Compress > Dedupe > Encrypt

If you are moving Encryption around and if they are the same block size you should not see any difference unless you are changing block size. A smaller block size means high compute usage but better read efficiency and a high block size means faster encryption and less compute load but less efficient read.  Neither will cause the space usage to change. 

Hope this helps answer your question!

Kind regards
Albert Williams

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