We have a Sun 4450 - quad quad core Xeon with 32G RAM that I'm trying to install RHEL6 on. Its currently running RHEL 4 and RHEL 5 and Solaris 10 (on different disks) just fine - but so far I've been completely unable to install RHEL6. I've tried both the i386 and the x86_64 DVDs, and both behave the same - everything seems fine until it starts to partition/format the disk, at which point it just kind of grinds to a halt. Usually its on the step where its putting a filesystem on the LVM, and I've left it sit there for a couple of hours with no progress, and I can't switch virtual terminals or anything. My gut feeling is a SCSI driver problem - on RHEL5 it uses the aacraid driver: Adaptec aacraid driver 1.1-5[2455] ACPI: PCI Interrupt 0000:09:00.0[A] -> GSI 19 (level, low) -> IRQ 98 PCI: Setting latency timer of device 0000:09:00.0 to 64 AAC0: kernel 5.2-0[15583] Nov 27 2007 AAC0: monitor 5.2-0[15583] AAC0: bios 5.2-0[15583] AAC0: serial AA0682 AAC0: Non-DASD support enabled. AAC0: 64bit support enabled. AAC0: 64 Bit DAC enabled scsi0 : aacraid but I see in the RHEL6 release notes that aacraid has been replaced with something else. What is the best step to debug this? Thanks for any help, Scott