Red Hat Bugzilla – Bug 18719
RH7.0 fails to install on Perc 3/DC if Perc 2/DC is present
Last modified: 2005-10-31 17:00:50 EST
When Perc3/DC and Perc2/DC are present on a system, RH installs on
Perc2/DC. If the Perc2/DC was added with some logical volumes after
installing on Perc3/DC, RH tries to boot of the Perc2/DC and the system
hangs with the following message "VFS: Cannot open root device 08:06
Kernel panic: VFS: Unable to mount root fs on 08:06". The megaraid (v1.09)
always insmod to Perc2/DC first. Slot assignment and cards BIOS
Enabling/Disabling doesn't have any effect.
This isn't really an installer issue, but a kernel issue, and fairly generic at
that. The question is, in what order should a device driver detect cards that
it supports? If you have disks on SCSI controllers such that you violate this
order, your root and /boot file systems wind up in the wrong place, and you
There needs to be a generic way to indicate to the kernel and various device
drivers which controller the BIOS thinks is your boot device, and make sure
that the right driver is loaded first, and that the right controller is
detected first by that driver. Volume labels help a lot, but don't handle the
cases of root, /boot, and swap properly, /boot necessary for lilo.
I2O controllers actually let you ask them if they were the boot device (the
controller firmware obviously knows this). We put the boot device first then
scan the others in PCI order.
Resolved in RH7.1