Azure Arc setup doesn't notify if sapce is less than 10% if more than 1 disk is present

Hi, If the disk space alert doesn’t fire when it should, it’s because the DCR is only collecting the _Total value, which is an average of all disks, not the separate data for each volume. Even if you set the rule to “Minimum”, you are still evaluating a single average. To make it actually work, there are just three steps: 1) edit the DCR and add the \LogicalDisk(*)\% Free Space counter so that it collects data for each disk individually (e.g. C:, D:…); 2) create an alert that “split” per disk, using InstanceName (Windows) or DiskMountId (Linux), with aggregation Minimum and threshold < 10% – so the rule evaluates each volume independently and fires as soon as even one goes below the threshold; 3) to test, fill a disk on a VM (with fsutil file createnew for example), wait 60 seconds, and check in the logs or graph that the value has arrived and that the alert has done its job. In short: collect data for each disk with the wildcard (*), create a rule that evaluates each volume separately and use Minimum to trigger the alarm as soon as just one is full. This way you avoid ignoring problems because “on average” the disks are fine.