OS drive failure and RAID5 mdadm question

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http://askubuntu.com – 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 confi (HowTos)