[GLLUG] Establishing Software RAID1

[Chick Tower]

I've found on-line instructions for setting up RAID1 with two disk 
drives on a system already running Linux.  After using mdadm to create a 
RAID set on two partitions already formatted ext3, they then say to 
issue the command

    mkfs.ext3 /dev/md0

Won't that erase anything already on the two drive partitions that make 
up md0?

Also, does anyone know where to buy SATA cables cheaply?  I think I need 
to replace one that I suspect is faulty.
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                                Chick