A18

Explanation

The system received an unsolicited device end interruption for a volume containing a paging data set. Volume serial verification failed for one or more of the following reasons:
  • The device address contained a volume with a different volume serial number.
  • An I/O error occurred while attempting to read the volume label.
  • The device went from ready to not ready status when volume verification attempted to read the volume label.

System action

The system enters wait state X'A18'.

Operator response

Do the following:
  1. Ensure that all volumes containing paging data sets are on the same device addresses as they were at system initialization.
  2. Ensure that all devices are ready.
  3. Restart the waiting processor.

Source

Input/output supervisor (IOS)