[mythtv-users] Rebuild raid array ?

[Greg Oliver]

On Wed, Nov 24, 2010 at 7:00 PM, Kevin Bailey <keraba at gmail.com> wrote:
> On Wed, Nov 24, 2010 at 3:23 PM, John Drescher <drescherjm at gmail.com> wrote:
>>
>> Not sure, I am not a ubuntu expert so I really can not help with any
>> thing specific to that distro.
>
> Here's what it says on boot-up:
> mount: mounting none on /dev failed: No such device
> udevd[927]: error getting socket: Invalid argument
> error initializing netlink socket
> udevd[927]: error initializing netlink socket
> libudev: udev_monitor_mem_from_netlink: error getting socket: Invalid
> argument
> Segmentation fault
> Gave up waiting for root device: Common problems:
> ...
> ALERT! /dev/md0 does not exist. Dropping to a shell!
> BusyBox...
> When I run dmesg in busybox, all I can see is the last screenful.
> Here's the relevant part:
> 14.639874] raid6: using algorithm sse2x4 (4465 MB/s)
> 14...] md: raid6 personality registered for level 6
> 14...] md: raid5 personality registered for level 5
> ...4
> ...10
> 14...] wait-for-root[977]: segfault at 34 rip 7451f7dc0cc2 rsp 7ffff001ee
> error 4
> But I was poking around this shell and found some interesting things.
> I didn't realize it, but I could run a 'mdadm --assemble /dev/md0' from
> here.
> The trouble is, it said something like:
> mdadm: USER root does not exist
> mdadm: GROUP disk does not exist
> bla bla bla failed
> Sure enough, there's an /etc directory but it doesn't have any passwd or
> group file.
> Yet /etc/mdadm/mdadm.conf says:
> CREATE owner=root group=disk mode=0660 auto=yes
> % ls -l /dev/md0
> brw-rw- 1 0 0 9, 0 2010-11-25 00:54 /dev/md0
> With every new piece of information, I get more and more suspicious of the
> upgrade to Lucid not creating the initrd correctly.

Are you lvm'ed?  Ubuntu desktop does not have lvm in the installer.
You have to install it prior to the partitioning portion of the
installer.  I do not have the rest of the thread to go through..