What am I doing wrong?

I ve to start with "I'm no disk expert", so please be patient.

My Dell machine order:
- PowerEdge 2850,
- 2 x 146GB SCSI Ultra320,
- PERC 4 Embedded RAID Option.
- C03 MR1, RAID 1 using on-board RAID controller.

(I used the ITU Diskette from Sun for LSI Perc 4e/di drivers,
http://www.sun.com/bigadmin/hcl/data...tails/806.html.)
I started the installation of Solaris 10 but I could only see one disk
(c0t0d0) during installation. (?)
I have two Scsi disks, and the idea is that they are set in RAID 1.

Boot path says: /pci@0,0/pci-ide@1f,1/ide@0/sd@0,0:a

Well, I continued the installation and Solaris 10 was finished and it
run well.
Now I wanted to test if RAID 1 was correct, "still".

1. I removed disk 1 and restarted
--------------------------------
The system answered with:
Following SCSI ID's are not responding
Channel-0:0
Please Inspect Enclosure Power, SCSI Cabling, and Drive Connections
and Reboot Your System.

1 Logical Drive(s) found on the host adapter.
0 Physical Drive(s) found on the host adapter.
1 Logical Drive(a) handled by BIOS
0 Physical Drive(s) handled by BIOS
Press to Run Configuration Utility or any other Key to
Continue.


2. I put back disk 1 and restarted
-----------------------------------
Solaris 10 run.


3. I removed disk 0 and restarted
----------------------------------
The system were angry now and I got response:
1 Logical Drive(s) found on the host adapter.
0 Physical Drive(s) found on the host adapter.
1 Logical Drive(s) Degraded
1 Logical Drive(a) handled by BIOS
0 Physical Drive(s) handled by BIOS
Configuration of NVRAM and drives mismatch (Normal mismatch)
User Configuration....

Run View/Add Configuration option of Config Utility
Press A Key to Run Configuration Utility Or to Continue.

ALT-F10 ...
No boot device available -
Strike F1 to retry boot, F2 for setup utility


Now it seems that the RAID-1 was not correct, why does Solaris only
find one disk ? where is the other one?
How can I install Solaris and have the RAID 1 from the HW (controller)?

When entering "Utility mode" I can see both disks.

I cleared the configuration and recreated the raid set, and
initialized.
So the system is clean again, and I need to re-install Solaris, but
please advice on how to get RAID 1 ?


Please advice,

Thank you!