Monitoring local volumes for presence and capacity

Get notified when a volume is missing.

Select a Volume from the list.

To receive notices if a volume goes offline, choose Monitor Presence

Adjust the time allowed before a notification is sent, from 1 to 59 minutes.

Get notified if a volume is too full

Select a Volume from the list

To receive noticies that the volume is too full, choose Monitor Capacity

Adjust the threshold at which a notification is sent from 1 to 99 percent. 

Regarding drives going offline, allowing for 0 minute (immediate) notification resulted in false positives.

Unlike other notices, Watchman Monitoring does not check this only on the agent's hourly run. We ship a background process called diskjournald to track which volumes are mounted, and when.

Monitoring Time Machine destinations for capacity is not recommended, as they can continue to serve their purpose even when 95% full. If backups can not complete in a given time frame, the Time Machine plugin will alert if backups cannot complete.

It is not necessary for a user to be logged in for Watchman Monitoring to run its daily inspections

When a locally connected volume is monitored for Presence, but there is no logged in user, notifications may be sent that the volume cannot be found.

Prevent this by selecting the checkbox "Prevent Missing Volumes warning by mounting volumes at the Login Window".

This checkbox does not effect Watchman Monitoring's software, rather, it sets a preference in OS X itself. This checkbox is the equivalent of running the the following command:

sudo defaults write /Library/Preferences/SystemConfiguration/autodiskmount AutomountDisksWithoutUserLogin -boolean true

Unchecking the box would be the same as running:

sudo defaults write /Library/Preferences/SystemConfiguration/autodiskmount AutomountDisksWithoutUserLogin -boolean false

On computers running Mac OS X Server, or Server.app, this checkbox will show as checked by default, as this reflects the state of the computer's configuration.