Then it might be spotlight going nuts on the mounted external drive! Make sure Spotlight isn’t going nuts on the external drive!Photos is not using iCloud, never turned on, it's using facial recognition to scan every image for faces. Though it is pretty crappy of Apple to grab as much data as it does by default with iCloud in macOS.
I does not, it's a background process. It starts up on its own at all hours of the day, like when the laptop is in a closed computer bag to get all super hot!
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It's not unique to my situation. Put a large Photos library (mine in this case is 115GB) on a network volume. Or just a slower external drive. Watch how long it takes the photoslibraryd process to finish running facial recognition scans on all of your photos.
I have a Photos library on a server share. Even though it is not the currently used Photos library, Photos insists on scanning it. It has been weeks and Photos hasn't finished scanning.
What sudo commands deactivate photolibraryd? This process is destroying my external drive that has the Photo Library by running 24/7 and the drive mechanism is grinding all day and night long. I have to force quit photolibraryd and then use Disk Utility to unmount my external Photos drive but it takes several attempts and timing to do it.I looked into it a bit more and, while there are ways to prevent photolibraryd from running via sudo commands, it should be noted that it doesn’t just scan for faces, but also for photo context and objects so that it can sort photos by categories such as museums, beach, animals, concerts,food, etc...