re[2]: [SSI] [Design] Cluster wide TCP and LVS

[Greg F. <fre...@No...>]

Aneesh,

I know you are familiar with TruClusters.

Are you just fishing to get someone else to tell you that yes this is done in =
other SSI clusters?

=3D=3D=3D  TruClusters design per my training classes

For each CVIP, there is a forwarder process.  (or maybe it is directly in the =
kernel?)

The forwarder process runs on a single node in a HA fashion.  If you have =
multiple CVIPs, then each forwarder can be on a different node to help load =
balance the IP traffic.

Only the node running the forwarding process for a specific CVIP responds to =
the specific CVIP at the NIC level.

When any process on any node binds to the the specific CVIP, its forwarding =
process is notified and the appropriate tables are updated.

Then all inbound packets to the CVIP go to the forwarding process which in turn =
forwards them to the appropriate Cluster Interconnect IP, and somehow they get =
thru the TCP/IP stack and to the correct process.

I don't know how outbound packets are handled.

=3D=3D=3D LVS   - ( I know very little about LVS, but ... )

I don't think LVS is currently designed to be this transparent.

To make it so, LVS itself may, or may not, need to be modified, but the TCP/IP =
stack in the non-forwarding nodes will definitely require significant =
modification.

Is this the path that the SSI team is trying to follow?


Greg Freemyer
Internet Engineer
Deployment and Integration Specialist
Compaq ASE - Tru64
Compaq Master ASE - SAN Architect
The Norcross Group
www.NorcrossGroup.com


 >>  Hi,
 >> =20
 >>      Does any clustering solution support a configuration in which there is
 >>  only one connection to the external network.ie only one/two  nodes of
 >>  cluster have a connection the outer lan ( ie two network cards ) All the
 >>  nodes have only one card that is used for cluster inter connection.( see
 >>  previous mail part 3 I have a picture there :) ) In this case all the
 >>  nodes will have one of this nodes as their gateway and we need to modify
 >>  the gateway configuration on all the nodes when the actual gw goes
 >>  down.( as suggested by Bruce )  That means these nodes that are
 >>  connected to the outer lan need to be configured as router that will
 >>  route the packets from all the cluster nodes.

 >>  Now how is CVIP fits in such configuration. Does the already existing
 >>  cluster solution support  binding  on cluster IP under  such
 >>  configurations ? If we need to allow this we need to make NAT=20
 >>  configuration as the LVS redirecting method  under such configuration.
 >>  We were looking at making Direct routing as the default  because of it
 >>  scalability. I haven't looked yet the NAT configuration failover
 >>  details.=20

 >>  Any comments ?=20

 >>  -aneesh=20





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