Collecting Memory Dump - NEC Express5800 Series Maintenance Manual

Chapter 1 Maintenance
7.2

Collecting Memory Dump

If an error occurs, the dump file can be saved to acquire necessary information.
Consult with your sales representative before dumping the memory. Dumping the memory while the server is in
operating normally will affect the system operation.
If a failure occurs and you want to collect memory dump, press the DUMP switch on CPU/IO module of primary
side for 4 to 8 seconds. The PRIMARY LED blinks when pressing the DUMP switch. Release your finger when
the LED goes off. Press the DUMP switch by inserting the pointed tool such as ballpoint pen into the switch
hole.
<How to press the DUMP switch>
0 sec 1 sec 2 sec
Press the DUMP switch
<Location of the DUMP switch>
If you press the DUMP switch, system restarts automatically and returns to duplexed state. Wait until the
memory dump finishes completely. The memory dump is stored in /var/crash/ directory. Memory dump is not
collected depending on CPU status (e.g. CPU stall).
After executing memory dump using the DUMP switch, the server may fail to restart. In such a case, forcibly
reset the server according to Chapter 1 (9.2 Forced Shutdown).
62
Restarting the system after error has occurred may display a message indicating
Important
insufficient virtual memory. Ignore this message and proceed. Restarting the system
at this time may result in dumping improper data.
3 sec 4 sec 5 sec
Press and hold

Pressing the DUMP switch excessively shorter or longer will fail to collect
Important
memory dump.

Do not use anything that easily breaks such as pencil, toothpicks, or plastic.
Memory dump process of the server may continue until the system returns to duplexed
Tips
state even after the restart. Wait for a while until duplication completes.
Express5800/R320e-E4, R320e-M4 Maintenance Guide (Linux)
6 sec 7 sec 8 sec
Release the switch
7. Collecting Failure Information
9 sec 10 sec 11 sec
Do not press the switch for
9 seconds or longer.
DUMP(NMI) switch