LVM problem

[Dan Coutu]

Ben Scott wrote:
> On Dec 14, 2007 10:45 AM, Dan Coutu <coutu at snowy-owl.com> wrote:
>   
>> Do a pvcreate /dev/sdb and it reports that all
>> is well. mkfs on /dev/sdb also goes well.
>>     
>
>   Did you do those in that order?  If so, you've likely overwritten
> the PV header (written by pvcreate) with a filesystem header (written
> by mkfs).
>
>   The order of operations is:
>
> 1. Add physical drive(s) to system
> 2. pvcreate on the device nodes for the new drive(s), to create PVs
> 3. vgextend to add the PVs to the VG
> 4. lvextend to add the new space to the LV
> 5. ext2online (or whatever) to expand the filesystem to use the space in the LV
>
>   I think you'll have to write a new PV header with pvcreate again.
>   
Yes, I did them in that order. The reason that I did the mkfs when I did 
was because, and I forgot to mention this,
when I did the vgextend it said:

# vgextend VolGroup00 /dev/sdb
  /dev/cdrom: open failed: No medium found
  Volume group "VolGroup00" successfully extended

cdrom open failed? Huh? This really threw me off. The /dev/cdrom device 
is a symlink to /dev/hda so where did that come from?

I've tried a new pvcreate but can't get rid of the uuid error message 
and cannot do any vg* commands at all because of it.

Thanks!

Dan