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That’s exactly what I see too with Google drives – frequent “pinning data” phases with extreme CPU loads. Unclear, why pinning needs to be performed at all. Neither directories nor metadata are being changed on any drive. One drive is only downloading (being scanned for Crashplan backup). The pinned data volume suddenly gets reduced by a certain amount (e.g. 200 MB), what then triggers such a pinning phase and lets the entire system freeze almost completely for a couple of minutes – that happens multiple times a day.

Is this for video editing? If so, you might want to consider larger SSDs for the cache, or using a non-pooled SSD for editing purposes and moving the files when you're done (the file you are creating - the source material will be fine left on the pool as you're only reading).