Quite a lot of writes to SSD cache, how identify? (looks like writes to docker.img)

Hello, My SSD cache has about 2TB written in two weeks only. That feels much for a 250GB ssd. No mover is used. Writing files to array directly. The ssd is used for the docker img and appdata. ~1 TB/week gives me about 2.8 years before hitting the TBW limit of 150TBW for warranty. 5 years or 150TBW, what comes first (Samsung SSD 860 Evo). I want to dig deeper. How can I see what it is, doing lots of writes to the ssd? Edit: I answer myself. "iotop" installed using Nerd

For anyone who cares... I've re-formatted the cache pool from encrypted-btrfs to just plain btrfs and the writes have droppped by almost 10x. Disk IO for [loop2] has gone from several GB's in a few minutes to maybe a 1GB in a couple of hours using iotop -a. Total writes for the SSD using LBA has gone to 1GB/hour, that is with appdata also on the same device. This will give a lifespan closer to 10 years instead of 1 year 🙂. Anyone real smart in here, that can explain the behaviour? I