Re: [Xen-users] CentOS 5.1 and Xen - mount: could not find filesystem '/dev/root'

[Erich Weiler <weiler@xxxxxxxxxxxx>]

Looks like I'm OK on that front, so I don't think the problem is LVM:

[root@xenserver xen]# lvscan
  ACTIVE            '/dev/tcga1vg/tcga1root' [10.00 GB] inherit
  ACTIVE            '/dev/tcga1vg/tcga1data' [500.00 GB] inherit
  ACTIVE            '/dev/tcga1vg/tcga1swap' [4.00 GB] inherit
[root@xenserver xen]#

Thanks for replying!

-erich

Jeff Cronstrom wrote:
> Hi Erich,
>
> Make sure that your LVM is active.
> I have seen an issue like yours before when trying to boot a VM from a
> physical partition with a Logical Volume that was not active.
>
> try running lvscan and make sure that "tcga1vg/tcga1root" is active.
>
> You should output something like this...
>
> [xenuser@XEN-Host-1 ~]# lvscan
>   ACTIVE   Original '/dev/Share2/Web2' [8.00 GB] inherit
>   ACTIVE   Snapshot '/dev/Share2/new_snapshot' [82.43 GB] inherit
>   ACTIVE            '/dev/Share3/Spam1' [8.00 GB] inherit
>   ACTIVE            '/dev/Share3/Spam2' [8.00 GB] inherit
>   ACTIVE            '/dev/Share3/Spam3' [8.00 GB] inherit
>   ACTIVE            '/dev/Share3/Spam4' [8.00 GB] inherit
>   ACTIVE            '/dev/Share3/Spam5' [8.00 GB] inherit
>   ACTIVE            '/dev/VolGroup00/LogVol00' [66.28 GB] inherit
>   ACTIVE            '/dev/VolGroup00/LogVol01' [1.94 GB] inherit
>   ACTIVE            '/dev/Share1/XenOS' [90.44 GB] inherit
>
> As far as whether it is para or fully virtualized that depends on how it
> is installed. I just work with para-virtualized systems so I do not know
> what to look for in the config for a fully virtualized VM.
>
>
> Jeff
>
> On Fri, 2007-12-14 at 06:28 -0800, Erich Weiler wrote:
> > Hi all-
> >
> > I'm hoping someone can help me with this problem with Xen under CentOS 
> > 5.1 (RHEL 5.1) I'm having... This is the Xen package that comes stock 
> > with the distribution, I didn't compile it from source.  I can boot 
> > Domain0 and the hypervisor just fine.  I'm trying to bring up a Xen 
> > guest VM and it crashes on boot, with this error:
> > # xm create -c tcga1 vmid=1
> >
> > ...
> > Creating root device.
> > Mounting root filesystem.
> > mount: could not find filesystem '/dev/root'
> > Setting up other filesystems.
> > Setting up new root fs
> > setuproot: moving /dev failed: No such file or directory
> > no fstab.sys, mounting internal defaults
> > setuproot: error mounting /proc: No such file or directory
> > setuproot: error mounting /sys: No such file or directory
> > Switching to new root and running init.
> > unmounting old /dev
> > unmounting old /proc
> > unmounting old /sys
> > switchroot: mount failed: No such file or directory
> > Kernel panic - not syncing: Attempted to kill init!
> >
> > I can't for the life of me figure this out... Here is my domain config 
> > file info:
> > kernel = "/boot/vmlinuz-2.6.18-53.1.4.el5xen"
> > ramdisk = "/boot/initrd-2.6.18-53.1.4.el5xen.img"
> > memory = 4096
> > name = "tcga1"
> > cpus = "" # leave to Xen to pick
> > vcpus = 2
> > vif = [ '' ]
> > disk = [ 'phy:tcga1vg/tcga1root,sda1,w' ]
> > disk = [ 'phy:tcga1vg/tcga1data,sda2,w' ]
> > disk = [ 'phy:tcga1vg/tcga1swap,sda3,w' ]
> > root = "/dev/sda1 ro"
> > extra = "selinux=0 3"
> >
> > I tried making a custom initrd file with --preload=xennet 
> > --preload=xenblk and that didn't seem to help...  Also I'm using LVM for 
> > my disk devices but I don't think that should make a difference?
> > I have the guest domain VM configured in fstab to reference sda1, sda2 
> > and sda3 as noted in the above config... Does anyone have guidance for me?
> > Also, one other question... Given my above config, is this VM running in 
> > para-virtualized mode or full-virtualized mode? I think it's para but 
> > hard to know for sure...
> > Thanks much in advance!
> >
> > -some_guy
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
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