I ran into the same problem. To fix this, goto the AMI site and download the megaraid driver for redhat 6.2.
when booting up select linux dd.
the device configurator will give you a list of options, select the one that says MegaRAID
here is a link to the driver:
http://megaraid.lsilogic.com/support...z&InpDrvID=203
And it works fine :-)
I am running a dell 2550 and installed RH 6.2
- jeremy