Moving a server over to a RAID

Mike A. Leonetti mikealeonetti at
Fri Aug 20 03:41:27 UTC 2010

 (2010?08?19? 22:36), justino garcia wrote:
> Why not use acronis for linux, or some imaging tool, but make sure
> your current linux install has support for said raid card.
> On Thu, Aug 19, 2010 at 12:09 PM, Rashkae <ubuntu at
> <mailto:ubuntu at>> wrote:
>     Mike A. Leonetti wrote:
>     >  I have a server now that has one drive and is not set up on a RAID
>     > using Ubuntu 8.04.
>     >
>     > What I was going to do was boot with a Linux recovery disc, create a
>     > RAID1 manually with mdadm on two new drives, and then copy all
>     of the
>     > data onto that then redo the boot partition.
>     >
>     > My question is, when I reboot, will Ubuntu automatically detect
>     the RAID
>     > for me or are there modules I have to install ahead of time to
>     make sure
>     > the RAID gets detected? Also, would anybody else handle the
>     situation
>     > differently :D.
>     >
>     There is going to be one hurdle you'll need to get over.. I forget the
>     exact command I used to recover, but I'll give you the overview.
>     When raid array's are created, they are given a "hostname", which, by
>     default, will by the system hostname.  By default, mdadm will not
>     auto-assemble raid arrays from a different hostname (to prevent
>     misunderstandings when hard drives are moved between different
>     systems.)
>      Unfortunately, Ubuntu must assemble the raid arrays from the Initrd
>     system, which will probably not contain your hostname unless you have
>     customized it.  I encountered this problem when I created the new
>     array
>     from the existing system, I do not know if you will have this
>     issue when
>     creating the array from the rescue cd.
>     When I tried to reboot the system, it was unable to mount the root
>     filesystem.  However, initrd dropped me to a busybox shell, from
>     which I
>     was able to run mdadm with options that would assemble the correct
>     array
>     *and* update the hostname of the array, (which I think is simply
>     "", ie.
>     empty, in initrd.)
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> Justin
To be honest I don't necessarily trust third party tools.  And I'm doing
this all on-site so if it's something that fails that means I'll just
have to be there for longer.
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