So far as I know the same model, and ideally the same HW revision, are required.
Here’s a discussion of how to implement it … Configuring 1+1 Backup by High Availability (HA) .
So far as I know the same model, and ideally the same HW revision, are required.
Here’s a discussion of how to implement it … Configuring 1+1 Backup by High Availability (HA) .