So there's a bit of homework to be done here.
First your Power7frame should have the split backplane feature. Your IBM sales rep should be able to tell if that frame is capable of it. This will let us unstall the VIO on the 2nd raid/hdisk's Sorry, don't have the feature codes off the top of my head.
Secondly, you will need additional HBA's and Ethernet adapters that are not allocated to any other lpar.
Lets take this example here: (Looks like junk can't post screenshots yet)
U78AA.001.WZSJVNE-P1-T9 PCI-E SAS Controller 10
U78AA.001.WZSJVNE-P1-T7 Universal Serial Bus UHC Spec 11
U78AA.001.WZSJVNE-P1-C19-T1 PCI-E SAS Controller Required 12
U78AA.001.WZSJVNE-P1-C7 1 Gigabit Ethernet (UTP) 4 Port Adapter PCIE-4x/Short 13
U78AA.001.WZSJVNE-P1-C2 1 Gigabit Ethernet (UTP) 4 Port Adapter PCIE-4x/Short Required 513
U78AA.001.WZSJVNE-P1-C3 8 Gigabit PCI Express Dual Port Fibre Channel Adapter Required 514
U78AA.001.WZSJVNE-P1-C4 Empty slot 515
U78AA.001.WZSJVNE-P1-C5 Empty slot 516
U78AA.001.WZSJVNE-P1-C6 Empty slot 517
U78AA.001.WZSJVNE-P1-C1-C2 8 Gigabit PCI Express Dual Port Fibre Channel Adapter 520
U78AA.001.WZSJVNE-P1-C1-C4 Empty slot 521
U78AA.001.WZSJVNE-P1-C1-C3 Empty slot 522
U78AA.001.WZSJVNE-P1-C1-C1 1 Gigabit Ethernet (UTP) 4 Port Adapter PCIE-4x/Short 523
This is all the hardware that I have available in one of my Frames. As you can see, I have one SAS controller, one Ethernet adapter, and one HBA as 'required' for this VIO profile.
If I showed you the other VIO, you would see Line 1, Line 4, and Line 10 would be required for the other VIO.
What I am trying to say, is if you do not have the physical IO to handle another VIO, there is nothing you can do.
Now, moving on:
Deploy the VIO via the TASKS > Configuration > Create Partition > VIO Server.
That should take you to a wizard to set up the partition ID (make note of this!) and define the resources. You can use your other VIO as reference.
From there, install the VIO OS on the hdisks mirror your rootvg or whatever other setup you need todo, get the WWN's and give them to your SAN team to zone.
Yes, you will need to zone the WWN's from the 2nd vio. But we are not ready for that yet.
So this part I'm going to be a bit fuzzy on, as I always had dual VIO's setup before deploying a LPAR. If any other Power guy wants to weigh in, now would be the time!
We need to create virtual adapters to tie into the new VIO.
Select the NEW installed VIO from the HMC, and under TASKS expand Dynamic Partitioning. Then select Virtual Adapters.
Enter your Virtual Fibre Channel Adapter number, select the client partition, and then enter the client adapter number.
Now, save all that information because we need to add that to the default profile as well. Reason being, the dynamic settings will disappear when the vio is rebooted as its not part of the default profile.
So, under TASKS again for the same vio, this time select Configuration, Manage Profiles. Repeat the tasks there with the same values you used.
Word of caution, you do not want to use the same adapter ID with two different VIO's.
What I do is match Client partition ID to VIO ID.
So, Server Adapter 301 is lined up to client adapter 301. That says to me, ClientID3, VIO1, then on the 2nd vio, I have 302 lined up with 302.
Now, on the client you are going to repeat the same steps that we did at the VIO. Dynamic Partitioning, add in Virtual Adapters. Then edit the default profile to add in the virtual adapters so when the client boots all the settings are present.
From here on, you should be able to zone the WWN's, cfgdev -vdev to find the hdisks. At this point you will want to run a chdev -dev hdiskXX -attr reserve_policy=no_reserve on all hdisks that are coming from SAN that you wish to have mapped though both vio's to the client lpar.
Then run mkvdev -vdev -vadapter <vhost> -dev <devicename that makes seance to you>
Example: mkvdev -vdev hdisk21 -vadapter vhost0 -dev dbtst4
Last but not least Ethernet adapters.
Without knowing how your Ethernet is configured on the VIO I can only guess how its setup and if not done carefully can cause a loop.
I am pretty dang sure I'm forgetting something. Its early, and I've not had enough coffee. I cannot yet posts links so take a google search for the vio cheat sheet
Feel free to toss me a direct message if you wish.