The z/VM *MONITOR record device driver failed to read monitor data
because the IUCV REPLY function failed. The read function against
the monitor record device returns EIO. All monitor data that has been read
since the last read with 0 size is incorrect.
User response
Disregard all monitor data that has been read since the last read with
0 size. If the device driver has been compiled as a separate module, unload
and reload the monreader module. If the device driver has been compiled
into the kernel, reboot Linux. For more information about possible causes
of the error see the IUCV section in "z/VM CP Programming Services" and
the *MONITOR section in "z/VM Performance".