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N8000 abnormal when deleting coordinator disks without disable IO fencing

Publication Date:  2013-09-24 Views:  183 Downloads:  0

Issue Description

In N8000 system, you can’t use the console IP to log into the system and the cluster status is abnormal. Two nodes can not form one cluster.

Alarm Information

VCS error

Handling Process

Stop VCS and IO Fencing :
Cer_02:~ # hastop –local
Cer_02:~ # /etc/init.d/vxfen stop
Stopping VxFEN:
2) Delete keys on each nodes
Cer_01:~ # cd /opt/VRTSvcs/vxfen/bin/
Cer_01:/opt/VRTSvcs/vxfen/bin # ./vxfenclearpre
3) Modify vxfenmode configuration file
Cer_02:~ # cp  /etc/vxfen.d/vxfenmode_disabled  /etc/vxfenmode
4) Modify , delete all “UseFence = SCSI3”

Root Cause

1) when N8000 system enable fencing function, the coordinator disks will be used to find which nodes form one cluster, it can keep the cluster normal when the brain-split happens.
2) In this case, coordinator disks are deleted without disabling fencing function, so the cluster can’t recognize which is the master node, and see the system 


1) Do not delete coordinator disks when enabling the IO Fencing