UPDATED: Building a channel under the SEA
AnthonyEnglish 270000RKFN Visits (9683)
Once you start thinking about redundancy, your pulse beats fast every time you have a whiff of what might be a Single Point of Failure. When that happens to you, then deep in your heart you know you have a mission in life. IBM Power Virtualisation will help you with that mission, because it allows you to set up a really robust network configuration from the Power Systems end.
Between the SEAs
With a dual-VIO server configuration (only available on the HMC, not IVM), you can set up a Shared Ethernet Adapter (SEA) in failover mode, which provides redundancy for the network. This really involves two SEAs - one on each VIO server. They communicate by means of a virtual adapter on each VIOS which is known as the control channel adapter. The control channel works as a heartbeat using its own VLAN, so that if the SEA with the higher priority (say priority 1 on VIO Server 1) loses its link to the world, the lower priority adapter (say priority 2 on VIOS 2) takes over.
Grow a trunk
You can grow your bandwidth and multiply redundancy by creating a SEA on a link aggregation / etherchannel / trunk (pick your terminology). You may have a 2-port adapter in an etherchannel on one VIOS server and another 2-porter on the other. Each SEA can use an etherchannel as its "real" adapter. But why stop there? After all, things can go wrong.
A shocking story (not for the faint hearted)
You just never know when you're going to need just a little bit of extra bandwidth, and there's one other thing to consider. Just in case your nightmares are running a little short in the thin
If you've still got a pulse, I'm sure you'll agree
So, what are you going to do about it?
Here's what: add more adapters and ports to your etherchannel. (You may now exhale)
See this updated post: Opening the Trunk Under the SEA
So how do you do it without an outage?
Let's say you have SEA 1 (priority 1) on VIOS 1 and SEA 2 on VIOS2. Here are the steps:
Sleeping in peace, under the SEA
After that, you can sleep in peace, because everything's under control, under the SEA.