Setup a Raid while OS is running

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Hi,

i have a server running on only one scsi disk. I got now one scsi disk
extra and i want to transform the actual installation to use both disks in
a raid1.
Therefore i want to mirror each partition with md.
The Question now is how to do that, if possible, without destroing the
installed OS.

I thought it should be possible to do it in the following way:

1. create the same partitions on the secondary drive
2. create a mirror for each partition with the actual installed partition
marked as "missing"
3. attach the missing partition (not sure how the specify sync direction)
4. edit fstab
5. reboot.

As u can see im afraid douing this becaus im not sure
a: how to specify sync direction and
b: if the creation of the now new superblock destroy my filesystem

So if someone have ideas, please

Greetings from munich

Stefan Majer

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