[disk spinup since ~ 6.6.x]

I am seeing this as well in 6.6.3. Even in safe mode, and disconnected from the network entirely.

• Set vfs_cache_pressure to 0 ("sysctl vm.vfs_cache_pressure=0")
• Execute find /mnt/user/SHARENAME of a fairly large share periodically for a while (I used the watch command)
• Eventually (sometimes it's more or less immediately, sometimes it takes a few hours) the find command will spin up and read some/all disks that share is on even though the dentries should be cached permanently. This will then proceed to happen more and more often, until it happens every find command issued.

 

This does not happen on 6.6.1, I don't have to install files to test on 6.6.2.