Getting started the hard way with RAID

[Ioannis Vranos]

On Fri, Dec 2, 2011 at 4:56 AM, Kevin O'Gorman <kogorman at gmail.com> wrote:
> I'm in the late stages of recovering a broken system.  The original
> had a hardware raid controller managing a mirror set that contained
> some stuff that was not backed up.  Fortunately, one reason it wasn't
> backed up is that it wasn't really vital.  Nevertheless, I'd like to
> get at that stuff.
>
> The hard part is that I no longer have that RAID controller, just the
> two drives.  The controller was a 64-bit PCI card, and the new mobo
> cannot handle it.  The mirror set does not show up at all in fdisk or
> gparted, though it's pretty obvious where it is.  Early in the
> recovery process, some other piece of software told me it saw the
> mirror set, but I don't remember which software that was.
>
> I left the drives uncabled since then.  Now I have them online again
> and I don't know where to start.  They seem healthy, and still have
> the two non-RAID partitions they're supposed to have.
>
> Is it possible for LVM to see that data?
> Any idea what tools I would need to finish the recovery?  Or am I just SOL?


I do not think LVM can see your RAID 1. As far as I know, LVM is like
RAID 0, with the exception that it writes on the second HDD after the
first one fills.

However Linux supports Software RAID 1. You may have a look at dmraid,
or mdadm tools.


-- 
Ioannis Vranos

http://www.cpp-software.net