Greetings all,
I'm building a 6-node hybrid virtual cluster, and would like a little
advice about quorum concepts, with the goal being functioning of at
least one virtual node, on one physical box, and the complete inability
of split-brain occurring.
I have Two Physical machines (PM) that will host many virtual machines,
however only three VMs per PM will actually be members of the cluster.
_Each_ PM is running VMware ESX 3, with:
* 3 es4ud5 cluster node VMs
* director node VM in an Active/Passive config
* various other, non-cluster nodes, out of scope.
The diagram of one physical machine with the relevant VMs, virtual
switches and virtual wiring can be seen below.
Each PM is a mirror image of the other:
(view this as a fixed font)
+------------------------------+
| PHYSICAL ESX BOX |
| +-----------------------+ |
| | VM Cluster Node1 |--+ |
| +-----------------------+ | |
| +-----------------------+ | |
| | VM Cluster Node2 |--+ |
| +-----------------------+ | |
| +-----------------------+ | |
| | VM Cluster Node3 |--+ |
| +-----------------------+ | |
| +---+---+------' |
| +-----------|---|---|---+ |
| |Cluster Virtual Switch |--+ |
| +--------------|--------+ | |
| 10.0.1.0/24 +-----+ | |
| +--------------------|--+ | |
| | Director VM Node (NAT)| | |
| +---|-------------------+ | |
| +-' 10.0.0.0/24 | |
| +-|---------------------+ | |
| |Director Virtual Switch| | |
| +----------|------------+ | |
| | | |
| | +-------' |
+===[fc0]===[e0]===[e1]========+
| | |
to SAN | `---> x-over cable to mirror box
To LAN
The cluster nodes will run GFS, the director will not. Only one director
will be active with a VIP, load will balance across all 6 VMs. The
crossover will actually have VLANs on it that will allow a separate
heartbeat net, but it was getting a bit tricky with ASCII art ;)
Can anyone see any issues that may arise where quorum could create a
split brain scenario? What would be the best way to approach votes, etc.
here?
Thanks all for your time.
--
Regards,
-C
Christopher Barry
Systems Engineer, Principal
QLogic Corporation
780 Fifth Avenue, Suite 140
King of Prussia, PA 19406
o/f: 610-233-4870 / 4777
m: 267-242-9306
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