There are several ways to turn off the scanning services within the My Cloud, but it generally has to be done via SSH. One can enable SSH through the Dashboard > Settings > Network page. Often people disable the following two services that deal with scanning/indexing media because they interfere with allowing the My Cloud to sleep when not in use. Issue the following two commands through SSH.
/etc/init.d/wdmcserverd stop
/etc/init.d/wdphotodbmergerd stop
There are ways to add those two lines so they run at startup every time the My Cloud is started/rebooted or do disable them entirely. Those methods are discussed in the following threads:
https://community.wd.com/t/how-do-i-stop-mycloud-scanning-my-many-many-research-files/95755/3
https://community.wd.com/t/wdmcserverd-and-wdphotodbmergerd-disable/140441/15
