[KLUG Members] md

[Phillip Hofmeister]

Here's how to do it:

You have drive A (currently has data)
Drive B - currently empty - you want to mirror data to it.

Here's how:

1. Create a new MD array with drive B as a member drive.
2. Configure the array with a second device, /dev/null.  In the
configuration file mark this device as failed.
3. Start your MD Array up.
4. Copy the data to it using cp -a
5. Unmount the old partition (drive A) from the file system
6. Mount the MD device to the file system
7. edit the configuration file to show drive A as the mirror drive for
the array.
8. do a mdhotadd/hotremove to remove /dev/null and add Drive A.
9. Drive A will begin to sync with Drive B.

Let me know if I can help you more.

On Mon, 06 Dec 2004 at 03:43:39PM -0500, Bruce Smith wrote:
> Is it possible to add software mirroring to an existing partition,
> without creating a new/empty mirror and copying the unmirrored partition
> to it?
> 
> I could swear that I saw Adam do that once at a KLUG meeting (add a 
> new partition, create a new raidtab file, and let md mirror over the
> existing data from the unmirrored partition), but the md docs don't
> mention this at all.
> 
>  - BS
> 
> 
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> 

-- 
Phillip Hofmeister