[CentOS] centos 5 GFS/Cluster - configure fence using NIC?

John R Pierce pierce at hogranch.com
Tue Jun 12 23:48:02 UTC 2007

Karl R. Balsmeier wrote:
> How does one configure a fence device in the form of a NIC card in 
> centos 5?  Is the gnbd item relevant to this?

I'm not sure what 'a fence device in the form of a NIC card' is.   the 
fence devices I'm familiar with include SCSI fence switches, 
fiberchannel SAN switches, and APC SmartPlug power switches.

in my test cluster, I used a Qlogic SANbox fiber switch to connect the 
cluster nodes to the shared storage.    the fencing was done by sending 
the Qlogic the commands to enable/disable the ports of the two nodes so 
only the active node could access the shared storage.

I suppose an Ethernet analog in an ISCSI SAN environment would be to 
send commands to a layer-2 or layer-3 managed switch to manipulate the 
VLANs to disable the standby nodes from accessing the ISCSI target 
device.   These systems would need separate dedicated NICs for LAN 
connectivity and cluster heartbeats.

More information about the CentOS mailing list