In the advanced settings of Plex Media Server for transcoder, setting the Transcoder temporary directory to a folder in a DrivePool causes Plex to show an error on playback.
I wanted to check if anyone else has that behaviour, if so, maybe include that in the limitations.
Also, perhaps a general guideline would be to put "cache" folders outside of Drivepool?
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EDIT: It looks like it works, the problem were due to some other error that caused the DrivePool to go in read-only mode (which a reboot fixed).