Specifications

MDR User Guide 85
A Troubleshooting
Below is a table of the most frequently occurring error situations and the actions for
correcting them.
Symptom/Error Message Remedy
The MDR client (Shell or API) is unable
to connect to the MDR server.
Connect a terminal to the MDR (i960) serial
port, and check for error messages.
The MDR system reports that some
disks could not be found.
Make sure that the Fibre Channel cable is
properly attached between the MDR and
JBOD/RAID. Check also that all the disks are
properly inserted.
There is no message sent to the i960
serial port when the MDR is powered
up.
Check that the MDR board is properly inserted
into your VME crate. Contact VMETRO to
verify that the board is correctly inserted.
The MDR client (Shell or API) is unable
to connect to the MDR server and the
latter does not print any error messages
to the serial port.
Check that the network (boot) parameters are
correctly set up.
The MDR server reports either DPIO
FIFO overflow or MIDAS Memory
buffer overflow during a recording.
Make sure that your data source is not sending
data faster than the MDR system is able to
handle. Also, check that the expected number
of disks is being used by the MDR server.
The MDR system only uses X out of Y
(expected) disks (with X<Y).
Check that the value of the item Disks in
section StorageInfo in mdr.ini is set to X.
The MDR system reports that it is unable
to configure a VMFC-2100 card.
Check that the VMFC-2100 card is positioned
in the PMC slot specified by the item VMFC-
2100UnitXPmcSlot
(X is 3 or 4) in section
StorageInfo in the mdr.ini file. Contact
VMETRO to verify that the card is in the
correct PMC slot.
FC Loop is : DOWN Check that the Fibre Channel cable is correctly
inserted into the JBOD/RAID and the VMFC-
2X00. Power up the JBOD/RAID and reboot
the system by pressing the Reset button on the
MIDAS board. Check that there is proper air-
cooling.
MDR client unable to connect to the
server.
Check the sX parameters in the mdr.ini file.
Recording table is invalid: should be
cleared.
If the recording data is not critical, clear the
recording table (MDR Shell command Clear),
Otherwise, try to swap disks in use (JBOD) if
some of them have been previously swapped.
If a new version has been installed on the
MDR, call VMETRO for information on how
to update the recording table without losing
data.
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