[CentOS] centos 5 GFS/Cluster - configure fence using NIC?
Karl R. Balsmeier
karl at klxsystems.net
Wed Jun 13 00:28:09 UTC 2007
John R Pierce wrote:
> 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.
OK, so it sounds like I have enough ethernet devices, and your notes
help me to understand the purpose and nature of fencing a lot more. I
just need to isolate the potential on the iSCSI side of the equation as
far as sending those signals to the managed switch.
Right now I run on extreme summit switches which should suffice, and
The iSCSI device we are using is a PromiseRAID M300i or M500i.
It sounds on the surface like we might need a more solid fencing
device... Anyone agree or disagree?
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