As per Guest Disk Space Alarm, if one has:
1.500 VM with disks around 50 GB
2.100 VM with disk around 1 TB
3.100 VM with disk around 2 TB
4.100 VM with disk around 3 TB
- below 10% Alerts is good for VM with 50 GB disks (5 GB is correctly alerted as low threshold)
- but below 10% Alerts is not a good value for other as 102,4 GB of frees space for 1 TB VM disks
so one need to create a custom alerts for 1TB for example to 1% or 0,5% (5 GB or 10 GB).
- but below 1% or 0,5 % is not so good for 2TB an so…
To avoid creating many custom Alerts for free disk space management, would be enough to put a
fixed under limit value, so for example one can specify: use one (probably the standard) “Guest Disk Space” Alert,
but ignoring all alerts for FREE DISK SPACE OVER X, for X one can put custom value, like 10 GB. This avoid complex
custom alerts configuration, difficult to maintain for many VMs and situations.