I'm not sure why it is failing to boot for you with 4 drives but you may want to try completing the install with 3 drives and then add the fourth drive to your array after a successful reboot.
J

On 01/22/2010 11:13 AM, Carlos Williams wrote:
I am successfully able to install Arch Linux with 3 drives in a RAID5
array on Arch Linux using:

mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/sda2 /dev/sdb2 /dev/sdc2

Now when I attempt the install with 4 physical disks and add the same
command above with just attaching /dev/sdd2 and changing the # of
devices from 3 to 4, I get a failure. When I reboot the system I lose
keyboard and it asks me to enter a run level. Obviously I can't
troubleshoot more because I have no keyboard.

What command should I use to create a RAID5 with more disk space (no
hot spare) using 4 drives? My commands and install method work perfect
with 3 drives but 4 and the system crashes upon reboot.

Any tips?

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