Failover / Fail over
Different formsUse failover as a noun or adjective and fail over as a verb.
Failover
Use when
You use the noun or adjective for the process or capability of switching to a standby system or component.
Example
“The team completed the failover successfully.”
Fail over
Use when
You use the verb meaning switch automatically or deliberately to a standby system or component.
Example
“The database will fail over to the secondary region automatically.”
Quick check
database will failover, system failed-over, please failover to
Usage note
This is technical terminology. For a general audience, explain what the system switches to rather than assuming readers know the term failover.