Forcing MDRaid Restart after Disk Fail

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First you'll probably want to go through When a RAID Array Refuses to Start. If the 'mdadm --assemble --scsan' fails, then reboot the system. You'll probably come up in rescue mode when the array fails to start on reboot. Then run: 

mdadm --create /dev/md0 --level=5 --raid-devices=4 /dev/sd[ad]1 --chunk=128 --parity=left-symmetric

The data in the above should match 

cat /proc/mdstat

and 

mdadm --examine /dev/sda1
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