Are we talking about "Datastore free space alarm"? Are you at vSphere infrastructure?
In the corresponding alarm`s "Assignment" tab you can click "add"->"Infrastructure Tree" and choose Datastores to be taken into account for that alarm. If you uncheck the desired datastore, it will not trigger the alarm.
aquiiinux wrote:A for the Suppress way, this will suppress "any backup job state" for that period, for the whole BAckup Infrastructure, which is not desired...
Not really, if you set suppression for the particular alarm, it will disable only that alarm for the indicated period of time.