Is there any way to see the compression ratio? I.e. the space as used by object storage(compressed) vs the "logical" space(uncompressed)

[DianaNites]

I want to see how well bucket-wide compression is working on my data, so is there any way to see how many bytes juicefs believes are on object storage as compared to how many bytes it logically has?

[Xuyuchao-juice]

Yes, you can use the following Prometheus metrics to monitor object storage usage:

• juicefs_object_request_data_bytes{method="PUT"} - Total bytes uploaded to object storage (compressed)
• juicefs_object_request_data_bytes{method="GET"} - Total bytes downloaded from object storage (compressed)

[DianaNites]

Would that not only be if i had been doing so since the first format and mount of a volume, and consistently every client?

[Xuyuchao-juice]

Yes, that’s correct. It’s only fully accurate if metrics have been collected from every mount/client since the beginning. Otherwise the sum is only a partial view, not the true volume-wide total.

At the moment, this is the closest reliable way JuiceFS can provide. There isn’t a more accurate built-in metric for the true volume-wide compressed size.

[DianaNites]

And there isnt a metric to show the logical(uncompressed) size? I could compare that to raw object storage size myself, if it existed, to get an approximate ratio.

[Xuyuchao-juice]

This is available. You can obtain it by using the "juicefs summary" command.