[one-users] Problem with ONE 1.4 and Xen 3.2

Mon Jan 4 07:51:42 PST 2010

Hi Nikola,

My setup uses Debian lenny (xen 3.2-1) and OpenNebula 1.4 (commit 817
from subversion). I solved this with limits to dom0 RAM memory.

I have 16GB of RAM memory, so i have the lines below in /boot/grub/menu.lst

## Xen hypervisor options to use with the default Xen boot option
# xenhopt=dom0_mem=4194304 noht

## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0

Then i run  update-grub and finally grub-install /dev/sdX

For safety, you may use the line below in  /etc/xen/xend-config.sxp

(dom0-min-mem some_number_less_than_total RAM)

for example: (dom0-min-mem 1280)

Did you have any line similar to the line below in /var/log/xen/xend.log?

VmError: I need 4169728 KiB, but dom0_min_mem is 2097152 and shrinking
to 2097152 KiB would leave only 1921196 KiB free.

I think that you should execute the following commands in Debian as root user:

ln -s /usr/lib/xen-3.2-1/bin/tapdisk /usr/sbin
echo xenblktap >> /etc/modules
ln -s /usr/lib/xen-3.2-1/bin/pygrub /usr/bin/

Cheers.
--
Ettore Enrico Delfino Ligorio
+55-11-3091-6480

On Thu, Dec 31, 2009 at 7:58 AM, Nikola Milutinovic
<n.milutinovic at levi9.com> wrote:
> On 30.12.2009 17:41, Nikola Milutinovic wrote:
>
> On 30.12.2009 16:13, Nikola Milutinovic wrote:
>
> Wed Dec 30 15:45:02 2009 [HOST][D]: Discovered Hosts (enabled): 0
> Wed Dec 30 15:45:02 2009 [VM][D]: Pending virtual machines : 33
> Wed Dec 30 15:45:02 2009 [RANK][W]: No rank defined for VM
> Wed Dec 30 15:45:02 2009 [SCHED][I]: Select hosts
>         PRI     HID     HSID
>         -------------------
> Virtual Machine: 33
>
> The clue here is the first line, 0 enabled hosts.
>
> Turns out that, since ONE relies on SSH access to monitored hosts, it is
> very sensitive to any "dirt" in the output. If you have a Banner or
> Message-of-theDay, it will definitely confuse ONE into thinking there is
> something wrong with the host. Turning both of those off solved the problem.
>
> Actually, a miss.
>
> That line meant "list of enabled hosts: ID=0". At this point I do not quite
> understand what is going on. Why is the VM left in pending state? I can
> force a VM deploy of that VM on the Xen host, which goes its way. Could it
> be due to some memory misinterpretation?
>
> oneadmin at vadmin:/srv/cloud/images/xen$ onehost list
>   ID NAME                      RVM   TCPU   FCPU   ACPU    TMEM    FMEM STAT
>    0 xen1.gc.com    0          800    800    800 4192256  131072  on
>
> oneadmin at vadmin:/srv/cloud/images/xen$ onehost show 0
> HOST 0 INFORMATION
> ID                    : 0
> NAME                  : xen1.gc.com
> STATE                 : MONITORED
> IM_MAD                : im_xen
> VM_MAD                : vmm_xen
> TM_MAD                : tm_nfs
>
> HOST SHARES
> MAX MEM               : 4192256
> USED MEM (REAL)       : 4061184
> USED MEM (ALLOCATED)  : 0
> MAX CPU               : 800
> USED CPU (REAL)       : 0
> USED CPU (ALLOCATED)  : 0
> RUNNING VMS           : 0
>
> MONITORING INFORMATION
> ARCH=x86_64
> CPUSPEED=1600
> FREECPU=800
> FREEMEMORY=131072
> HOSTNAME=xen.gc.com
> HYPERVISOR=xen
> MODELNAME=Intel(R) Xeon(R) CPU           E5310  @ 1.60GHz
> NETRX=0
> NETTX=0
> TOTALCPU=800
> TOTALMEMORY=4192256
> USEDCPU=0
> USEDMEMORY=4061184
>
> I mean, this is normal for Xen, it gives all available memory to Dom0 and
> Dom0 will take that memory and give it to the VM, I've seen messages in
> xend.log stating "baloon driver reducing memory of Dom0". Should I manually
> reduce the memory available to Dom0?
>
> Nix.
> --
> Met vriendelijke groet / Kind regards,
> Nikola Milutinovic
> Sr Java Developer
> Levi9 Global Sourcing
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