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We have an existing /dev/sda disk, we are adding an identical /dev/sdb

I want to place these two disks in a raid-0 array.

Can I do that without reformating /dev/sda?

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up vote 5 down vote accepted

No. But you can create a RAID-0 array containing only /dev/sdb, copy the data from /dev/sda to /dev/md0 , then add /dev/sda to the array. Voila, data preserved!

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Note that you don't format sda, you just add it to the array. – psusi Apr 18 '13 at 14:12
@psusi: Good point, edited. – Piskvor Apr 18 '13 at 16:39

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