Lost space or expected?

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Hi all,

Here's the output of 'rados df' for one of our clusters (Luminous 12.2.2):

ec_pool 75563G 19450232 0 116701392 0 0 0 385351922 27322G 800335856 294T
rbd 42969M 10881 0 32643 0 0 0 615060980 14767G 970301192 207T
rbdssd 252G 65446 0 196338 0 0 0 29392480 1581G 211205402 2601G

total_objects 19526559
total_used 148T
total_avail 111T
total_space 259T


ec_pool (k=4, m=2)
rbd (size = 3/2)
rbdssd (size = 3/2)

If i calculate the space i should be using:

ec_pool = 75 TB x 1.5 = 112.5 TB  (4+2 is storage times 1.5 right?)
rbd = 42 GB x 3 = 150 GB
rbdssd = 252 GB x 3 = 756 GB

Let's say 114TB in total.

Why is there 148TB used space? (That's a 30TB difference)
Is this expected behaviour? A bug? (if so, how can i reclaim this space?)

kind regards,
Caspar
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