Raid utility - hardrive icon greyed out although drives are ok?

Hello,
I've been trying to create a Raid set (raid 0), and later are going to create a second raid set (raid zero) to mirror it so Raid 0+1. We installed a raid card last week In Raid utility the hardrive icon is greyed out. The battery conditioned, apaprently successfully, but has started conditioning again. We sucessfully created a raid zero set in disk utility from the two drives, but Raid Utility doesn't recognise them. I haven't done this before so apologies if i misunderstand or explain anything badly. Help greatfully received : )
Mac Pro 10.6.6

Dedicating four drives to hold data that could be serviced by one will not get you performance or data security. If you seek performance, use a pair of drives to create a Striped RAID, and plan on rolling the files off to another medium at the end of the day or every few days.
Mirrored RAID is NOT Backup. It extends the time-to-repair after a drive failure, and is useful for mission-critical and near-non-stop services. You still need a backup scheme. If you have to do backups anyway, why bother with Mirrored RAID unless you have data that meets the description above?
We sucessfully created a raid zero set in disk utility from the two drives, but Raid Utility doesn't recognise them.
You choose one or the other. Either you are using RAID Utility and the RAID card, OR
... you are NOT using the RAID card and using Disk Utility.
The RAID card is useful for RAID schemes where checksums must be computed and checked on-the-fly, such as RAID 5.

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