Re: Converting system to raid

[Robin Hill <robin@robinhill.me.uk>]

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On Fri Apr 10, 2009 at 10:29:59PM -0700, Timothy D. Lenz wrote:

> From: "CoolCold" <coolthecold@gmail.com>
> 
> > Yes, he should provide correct /etc/mdadm/mdadm.conf and
> > update-initramfs -u on md boot, smth like
> > chroot /mnt/md0
> > update-initramfs -u
> 
> How would this help in a system that doesn't ramdisk built in to the
> kernel or as a module? Or does it change some other stuff?
> 
This is useless if you don't use an initrd.

> I started looking at the stuff that was copied to md0 and /md0/dev is
> empty. Looking through the guides I found a few things. One said that
> using cp had to be from root or not everything would get coppied. I
> used sudo but I know some things require you to root.
>
This shouldn't matter in this case.  The reason you're getting nothing
copied in /dev is that it's a mounted filesystem, and your copy command
specifically excludes mounted filesystems.

> Also this:
> ===============================
> # rsync -avHhx --progress / /mnt/raid-md0
> 
>     * If the system wasn't previously in single user mode, move to
>     single user mode and update the data that changed during the first
>     copy:
> (--delete flag tells rsync to delete files from the destination which
> do not exist on the source):
> 
> # rsync -avHhx --progress --delete / /mnt/raid-md0
> 
Yes, this is an alternative to running from a bootable CD.  In
single-user mode (init 1), there can be no background applications
running, so there should be no open files to worry about.  I'd still
rather use a bootable CD though.

>     * Create needed device nodes:
> 
> # cd /mnt/raid-md0/dev/ && MAKEDEV generic
> ===============================
> Using rsync from single user mode still left /mnt/md0/dev empty. I
> read up in "makedev generic" and it seems to be a shotgun fix adding
> way more then is needed. Is there a way to create just what is in
> /dev?
> 
Again, the rsync command includes the 'x' option so excludes mounted
filesystems (which is what you want here).  You can copy the necessary
/dev entries manually - I think the only entries you need are
/dev/console & /dev/null, so:
    cp -a /dev/console /dev/null /mnt/raid-md0/dev

Cheers,
    Robin
-- 
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    ( ' }     |       Robin Hill        <robin@robinhill.me.uk> |
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