Xen users - Jun 2008 - unable to start 7th domU

Hi,
I have created 6 domU but after I created the 7th domU, I am not able to
start it up.  The error message I get is as follows:
 sending termination signals...done
sending kill signals...done
disabling swap...
        /dev/mapper/VolGroup00-LogVol01
unmounting filesystems...
        /mnt/runtime done
        disabling /dev/loop0
        /proc done
        /dev/pts done
        /sys done
        /tmp/ramfs done
        /selinux done
        /mnt/sysimage/boot done
        /mnt/sysimage/sys done
        /mnt/sysimage/proc done
        /mnt/sysimage/selinux done
        /mnt/sysimage/dev done
        /mnt/sysimage done
rebooting system
Restarting system.
Guest installation complete... restarting guest.
libvir: Xen Daemon error : POST operation failed: (xend.err "Error creating
domain: Boot loader didn''t return any data!")
exception was: virDomainCreate() failed POST operation failed: (xend.err
"Error creating domain: Boot loader didn''t return any data!")
Domain installation may not have been
successful.  If it was, you can restart your domain
by running ''virsh start dom7''; otherwise, please
restart your installation.
[root@bogon ~]# /usr/sbin/xm list
Name                                      ID Mem(MiB) VCPUs State   Time(s)
Domain-0                                   0      279     2 r-----   8202.6
dom1                                      19      249     1 -b----   1707.2
dom2                                      17      249     1 -b----   2704.6
dom3                                      23      255     1 -b----   1325.9
dom4                                      16      255     1 -b----   2107.6
dom5                                      28      255     1 -b----   4596.8
dom6                                      27      255     1 -b----    975.1
[root@bogon ~]# /usr/sbin/xm create dom7
Using config file "/etc/xen/dom7".
Traceback (most recent call last):
  File "/usr/bin/pygrub", line 656, in ?
    chosencfg = run_grub(file, entry, fs)
  File "/usr/bin/pygrub", line 513, in run_grub
    g = Grub(file, fs)
  File "/usr/bin/pygrub", line 203, in __init__
    self.read_config(file, fs)
  File "/usr/bin/pygrub", line 393, in read_config
    raise RuntimeError, "couldn''t find bootloader config file in
the image
provided."
RuntimeError: couldn''t find bootloader config file in the image
provided.
No handlers could be found for logger "xend"
Error: Boot loader didn''t return any data!
Usage: xm create <ConfigFile> [options] [vars]


I have searched on google but could not find anything useful there.  Could
someone tell me what is wrong with my setup?

Thanks,
Pete


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> Hi,
> I have created 6 domU but after I created the 7th domU, I am not able
to
> start it up.  The error message I get is as follows:
Are you using file backed virtual disks (eg file: instead of phy: or
tap:)? Could you have run out of loop devices? (I can''t remember if
tap:
uses loop devices or not)

Stop all your domU''s, then say:

rmmod loop
modprobe loop max_loop=32

And see if you can load more than 7 DomU''s.

James


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