Oh and update, in case anyone is following along with similar issues with drive power saving...
""*-keeping the USB disk pack in standby is proving difficult. Current issue is the software RAID waking the raid1 pair VAULT to update it or something. Wakes it up f or about 5 minutes every 10!.""
This turns out to be caused by Ubuntu's default enabling if Smart Mon tools which poke the drive periodically for a Smart data update.
Using: systemctl disable smart-mon-tools
Took care of it and now the drives actually sleep all night. That's another few quid a month saved.
""*-keeping the USB disk pack in standby is proving difficult. Current issue is the software RAID waking the raid1 pair VAULT to update it or something. Wakes it up f or about 5 minutes every 10!.""
This turns out to be caused by Ubuntu's default enabling if Smart Mon tools which poke the drive periodically for a Smart data update.
Using: systemctl disable smart-mon-tools
Took care of it and now the drives actually sleep all night. That's another few quid a month saved.