creating raid with existing data?

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I've got /dev/sda with data on it, I want to add /dev/sdb on as a
mirror (raid-1), can I do this without destroying data on /dev/sda
when creating the raid? I've setup /dev/sdb to have all the same
partitions and sizes as /dev/sda has, and I've setup a raidtab file so
that all the devices match up, but I am a little paranoid about
creating the raid because I dont want to destroy data on /dev/sda.

Thanks!
Micah
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