Fedora xen - Apr 2009 - Problem: mount: could not find,filesystem '/dev/root'

Hi, All:

  I got a problem (mount: could not find,filesystem
''/dev/root'') in booting
a fedora7-xen kernel which was downloaded at
http://rpm.pbone.net/index.php3/stat/3/srodzaj/1/search/kernel-i686. Also I
had tried fedora8-xen kernel, same problem.

  Here is my "grub.conf":

  title Fedora (2.6.21-7.fc7xen)
        root (hd0,0)
        kernel /xen.gz-2.6.21-7.fc7
        module /vmlinuz-2.6.21-7.fc7xen ro /dev/VolGroup00/LogVol00 rhgb
quiet
        module /initrd-2.6.21-7.fc7xen.img

 title Fedora (2.6.27.21-170.2.56.fc10.i686.PAE)
        root (hd0,0)
        kernel /vmlinuz-2.6.27.21-170.2.56.fc10.i686.PAE ro
root=/dev/VolGroup00/LogVol00 rhgb quiet
        initrd /initrd-2.6.27.21-170.2.56.fc10.i686.PAE.img

 title Fedora (2.6.27.21-170.2.56.fc10.i686)
        root (hd0,0)
        kernel /vmlinuz-2.6.27.21-170.2.56.fc10.i686 ro
root=/dev/VolGroup00/LogVol00 rhgb quiet
        initrd /initrd-2.6.27.21-170.2.56.fc10.i686.img

  The "ro /dev/VolGroup00/LogVol00 rhgb quiet" part was the same in
all the
three ones, but "Fedora (2.6.27.21-170.2.56.fc10.i686.PAE)" and
"Fedora
(2.6.27.21-170.2.56.fc10.i686)" could  boot normally (this showed the path
should be right).

  The difference between the first and the latter two was "module",
but the
tries:
        title Fedora (2.6.21-7.fc7xen)
        root (hd0,0)
        kernel /xen.gz-2.6.21-7.fc7 ro /dev/VolGroup00/LogVol00 rhgb quiet
        module /vmlinuz-2.6.21-7.fc7xen
        module /initrd-2.6.21-7.fc7xen.img
and
        title Fedora (2.6.21-7.fc7xen)
        root (hd0,0)
        kernel /xen.gz-2.6.21-7.fc7 ro /dev/VolGroup00/LogVol00 rhgb quiet
        initrd /initrd-2.6.21-7.fc7xen.img

neither worked.

  My os was Fedora 10, and xen was install by "yum install xen". What
should
I do for this problem??

  By the way, it seemed that "yum install kernel-xen" installed
"2.6.27.21-170.2.56.fc10.i686.PAE", which did not worked. Since when I
booted with this fedora-xen kernel, "xend start" command (or xm
command)
brought "ERROR Internal error: Could not obtain handle on privileged
command
interface (2 = No such file or directory)" error, which I''ve no
idea either.
(From google, someone told that it was caused by wrong kernel...)

  Any helps will be very appreciated!

Best Regards!
Xin

On Wed, 2009-04-08 at 01:44 -0500, Yang Xin wrote:
>   By the way, it seemed that "yum install kernel-xen" installed
> "2.6.27.21-170.2.56.fc10.i686.PAE", which did not worked. Since
when I
> booted with this fedora-xen kernel, "xend start" command (or xm
> command) brought "ERROR Internal error: Could not obtain handle on
> privileged command interface (2 = No such file or directory)" error,
> which I''ve no idea either. (From google, someone told that it was
> caused by wrong kernel...)
Since an update to Fedora 9, the kernel-xen package has been obsoleted
by the kernel package
* http://fedoraproject.org/wiki/FWN/Issue137#kernel-xen_is_Dead
*
http://docs.fedoraproject.org/release-notes/f10/en_US/What_Do_System_Adminstrators_Care_About.html#sn-Unified_kernel_image

The current kernels in F9 and F10 only function as a domU (xen guest).
Fedora 10 does not function as a dom0 (xen host).

It sounds like your initrd does not have sufficient intelligence to read
your root device (hint mkinitrd). I don''t even know if you could force
a
F7 or F8 kernel into F10, but I would not try it.

If you need a Xen dom0 then use CentOS, RHEL, or F8 for your server. But
F8 is end of life and not receiving any updates, so that is not the
safest or recommended route.

There are some highly experimental dom0 kernels for F10, but don''t
expect to use them for anything more than testing.
*
http://fedoraproject.org/wiki/FWN/Issue170#Experimental_Dom0_Kernel_Update

-- 
Dale Bewley - Unix Administrator - Shields Library - UC Davis
GPG: 0xB098A0F3 0D5A 9AEB 43F4 F84C 7EFD  1753 064D 2583 B098 A0F3