I have used the above Guide, but in the end it doesn't work. Like others I had the problem " cannot open root device md3". The solution is on your forums: Let the kernel know your md3 layout in grub kernel /boot/kernel root=/dev/md3 md=3,/dev/sda3,/dev/sdb3 Maybe it is worth putting it in the guide Reproducible: Always Steps to Reproduce: 1. Follow the guide with liveCD 2006.1 and AMD64 proccessor 2. Don't use ssh, but use the LiveCD and stay behind your box 3. reboot Actual Results: Kernel Panic " cannot open root device md3 " Expected Results: complete to boot
I've had no such troubles following this guide to install Gentoo on my AMD64 (RAID1), nor do I need that extra weird line in grub.conf. All that's needed is root=/dev/md3 The guide does work ('ve tested it twice); it sounds more like you might have made a mistake in setting up mdadm.
mdadm is a userspace process; kernel unable to find root is a kernel issue my guess would be you didnt create your raid devices with raid autodetect so the kernel on booting up doesnt automatically detect your raid setup
the gentoo short install guide advises to use kernel parameter root=/dev/md3 however, this requires particular changes to the kernel during make menuconfig in /usr/src/linux . Otherwise the above problem will be reproduced. suggestion: provide working kernel configuration that supports non-RAID systems. the boot problem is not a bug, it is merely a user unfiendly configuration.
during make menuconfig, ensure that your SATA drivers and automount capability is enabled. The preconfigured kernel config has most drivers not enabled.
