Hello Malcolm,

You should consider using a VIP (Virtual IP) to let users connect to the current primary regardless of a mirror switch.

Usually, the arbiter machine, does not require IRIS to be installed, only the ISCAgent service, but if you have IRIS there with a license server than you lose the HA for licensing (in case arbiter machine is down).

you can use class: %SYS.DatabaseQuery with "GetDatabaseFreeSpace" classmethod (for single directory) or a "FreeSpace" query (for multiple or *)

Create your own class that Extends %SYS.Task.Definition and add your code in Method OnTask() As %Status

then you can tie this to task manager.

Very good article Ashok!

If someone is going to calculate age in a production system, one should divide by 365.25 (to take into consideration leap years)