Unplug of private interconnect cable restart the system!

Question

Dear All,
My Database is 2 Node RAC Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production on Linux.
I had a strange experience with my private interconnect between the 2 nodes. I need to replace switch between the nodes with a new and better switch. When i plugged wire from one node, the machine restarted. Similarly while I plugged the wire from the other node, the same machine that was restarted earlier, restarted again.
Have you ever faced such a problem? What can i investigate? Any clue please.
Also I want to know what is the difference of if we update the remote listener with IP instead of scan IP name?
SQL> show parameter remote_listener
NAME TYPE VALUE
remote_listener string 10.168.20.29:1521
This is the only thing i doubt creating the problem. All other configurations are as per documentation.
Your kind help will be appreciated.
Regards,
Imran
Regards,
Imran

Answer 1

Yeah as far as I have seen this seems to be the problem.
CRS was already not accessible by the nodes and when i un plug the cable from one node it restarted and Scan IP was not accessible for clients to connect the database.
I configured Oracle ASM on SAN device using multipath.
Now in OEM i see:
Serviced Databases
Name     Disk Groups     Failure Groups     Allocated Space (GB)     Availability     Alerts
racdbdb_racdbdb1     FRA, DATA     n/a     288.27     [Availability]      21
RACDB-cluster     CRS     n/a     0.26     Not Monitored
But when i run this query:
SQL> SELECT NAME, STATE, OFFLINE_DISKS FROM V$ASM_DISKGROUP;
NAME STATE OFFLINE_DISKS
CRS MOUNTED 0
DATA CONNECTED 0
FRA CONNECTED 0
How can i check that voting disk is functional? Kindly help
Regards,
Imran