Raid1 post installation

[tony.chamberlain at lemko.com]

Hello

They sent off a linux machine (installed with some software) to a customer.
Normally, when we install Linux (Cent OS 4.5) we do software Raid Level 1 during the
installation (/dev/sda and /dev/sdb). This machine went out without them doing it.

The machine that went out should already a /dev/sda and /dev/sdb (anyway to verify, if
/dev/sdb is not mounted?) and we need to perform Raid 1 on it, but we can't reinstall
Linux on it because it will overwrite evrything that is there.

Is there anyway to Raid a machine that already has linux installed on it without reinstalling
Linux over it? 

Thanks

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