IOS091I

Explanation
In response to the SET IOS=xx or
SETIOS MIH,… command, the system displays this message. The system
did not start the timer for a missing interrupt handler (MIH) time
interval.
In the message text: name
The name of the MIH time interval control block.

System action
The system continues processing. The system does
not monitor the devices in the specified MIH device class.

System programmer response
Search problem reporting databases
for a fix for the problem. If no fix exists, contact the IBM® Support Center.

Source
Input/output supervisor (IOS)