I'm fairly new to Ubuntu but I was able to setup my server with RAID5. The OS resides on a separate drive and there are 3 drives in my array.
The problem is that I had to reinstall my OS on a new drive (currently /dev/sdd) due to a hardware failure and needed to recover my array. mdadm did not create it auto-magically after installing so I followed the instructions SpamapS posted in this thread and got to the point where I recovered the array and could access it using:
mdadm --assemble /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1
Now in the next step he says that I'll
want to save the configuration if you have to do that manually:
And then update the initramfs for your system:
This is where I am not sure how to proceed. I want to make sure that my array will come up after a reboot.
Thanks in advance!