The server ends an export operation for the specified session because an I/O error has been encountered by the server in reading from a device. The object for which the I/O was issued is reported in a later message.
Export processing skips this file, and continues operation.
Query the activity log to find messages preceding this one that specify the device that is failing. Storage pool volumes can be varied offline (by using the VARY OFFLINE command), or the server may need to be shut down with the HALT command to correct the hardware problem.