On Mon, 2 Nov 2009, Joe Pruett wrote:

> Date: Mon, 2 Nov 2009 09:30:22 -0800 (PST)
> From: Joe Pruett <[email protected]>
> Reply-To: "General Linux/UNIX discussion and help;    civil and on-topic"
>     <[email protected]>
> To: "General Linux/UNIX discussion and help;  civil and on-topic"
>     <[email protected]>
> Subject: Re: [PLUG] Linux RAID1 question
> 
>> Is it possible to take an ordinary, non-RAIDed hard drive, and turn it
>> into a mirror without losing any data, using linux software RAID?
>
> i'm assuming you have one disk with data and one spare.  the safe way is
> to create a broken mirror with the spare drive and "missing" as the
> other piece.  then copy all the data from the current drive to the mirror.
> then reboot off the mirror and add the original drive to the mirror so it
> can resync.  this involves lots of fdisk, mdadm, tar/rsync/cp, etc. so you
> really need to know what you're doing.

Your assumptions re: disk configuration are correct. I will try it!
The ability to create a broken mirror is key. Thanks.

Carlos
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