Logs: What is the difference between "OpenSearch Disk Capacity" and "Net Availability Capacity"?

[geffchang]

The Cloud Portal Logs page mentions about "OpenSearch Disk Capacity" and "Net Availability Capacity".

1) What is the difference between these two?

2) I want to know the maximum size of the Kibana logs. What capacity does this refer to? OpenSearch Disk Capacity or Net Availability Capacity?

[mansurarisoy · Accepted solution]

I think the note in the documentation explains the difference between the two storage sizes:

OpenSearch replicates logging data to assure high availability, which doubles the storage space required to store the data volume.

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For example, the total storage space is 300 GB for development and half of the storage is used for the original data and the remaining half is for the replica.

There is a similar calculation in the Amazon OpenSearch Service documentation under Calculating storage requirements

In summary, if you have 66 GiB of data at any given time and want one replica, your minimum storage requirement is closer to 66 * 2 * 1.1 / 0.95 / 0.8 = 191 GiB. 

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So, I assume that in SAP Commerce Cloud, OpenSearch environments are configured with one replica, which is why the required space is twice the available data space. Additionally, the KBA you mentioned in your comment (SAP KBA 3446887) appears to follow a similar calculation and assumption.

[geffchang · Accepted solution]

That makes sense. Thanks!