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I am trying to understand how to scale my Prometheus and look at the storage mechanic for this.

Lets assume the following:

  1. Prometheus data storage Directory: 20GB in size
  2. Snapshots amount: 3
  3. Snapshot Size: 18GB each

Question: Without symlinks, how is the sum of each snapshot size larger than the total size of the directory? How is it ensured that taking a Snapshot will contain all the data required?

I assume that the storage mechanism of Prometheus will store references instead of real data. But what system is exactly at work here, I tried to find out the mechanic behind this.

Pointers in the right direction are welcome as well. I would like to understand the principles at least.

Panade
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