Currently the configuration for disk space monitoring in “RedGate Monitor” only gives the option to check on the number of bytes that is still free on the disk (in GB or MB).

Ideally one should check on the number of bytes in combination with the % free space.
The reason for this is that percentage hugely differs depending on the total size of the disk. On a small disk one would like to extend the disk when it is 80% FULL, where as on a much bigger disk, 20% space might still be many GB’s and to early to extend the disk.

A suggestion would be to have an alert generated when for instance: Free space < 20% AND # bytes free < 50GB