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AWS Docs describe Burst Balance and EEBS IO Balance in the following way:

BurstBalance The percent of General Purpose SSD (gp2) burst-bucket I/O credits available.

EBSIOBalance% The percentage of I/O credits remaining in the burst bucket of your RDS database. This metric is available for basic monitoring only. This metric is different from BurstBalance

However, as far as I know, the docs do not explain how those two metrics are different.

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  • One is an absolute value, one is a percentage.
    – Tim
    Commented Oct 4, 2021 at 2:34
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    @Tim They are both percentages as quoted above "BurstBalance The percent of General Purpose SSD (gp2) burst-bucket I/O credits available" "EBSIOBalance% The percentage of I/O credits remaining in the burst bucket of your RDS database". Indeed we have been recently running out of EBSIOBalance but not of BurstBalance.
    – Zillo
    Commented Oct 4, 2021 at 13:07
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    (Not to be confused with EBSByteBalance%.)
    – David Winiecki
    Commented Jan 14, 2023 at 21:16

1 Answer 1

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BurstBalance is an EC2 / EBS metric (EBS falls under the EC2 namespace). EBSIOBalance% is an RDS metric. Under RDS you can't see the EBS volume burst balance directly which is why RDS has to expose it.

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    And yet I have burst balance in RDS with gp2 storage. It goes away with gp3 storage, however.
    – Quolonel Questions
    Commented Dec 31, 2023 at 9:16
  • @QuolonelQuestions "Under RDS you can't see the EBS volume burst balance directly which is why RDS has to expose it". i.e. RDS shows you the storage burst balance.
    – Tim
    Commented Dec 31, 2023 at 18:41

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