kernel errors, timeouts and qemu-img usage

[Christoph Raible <c.raible@science-computing.de>]

Hi @all,

I got some errors after compiling an configuring ceph on Scientific 
Linux 6. ( This works all fine with no errors)

First of all I want to explain my Systems:

Server0-3:

- Scientific Linux 6:
   - Self compiled Kernel 2.6.38.4 from Kernel.org with ceph-modules
   - 4 partitions:
     - /           <---  20 GB - ext4
     - /srv/cloud  <---  20 GB - ext4
     - /dev/sda5   <---   1 GB - ext4   ceph journaling system
     - /dev sda6   <---  50 GB - ext4   ceph fs mounted to /mnt/data

I didn't use brtfs, because ext4 is an requirement of my professor (I'm 
writing my bachelor thesis)


My ceph.conf:  http://pastebin.com/vdwfHNy3

- 3 OSD
- 2 MDS
- 3 Monitors




---------------------------

Now to my errors I got.



First I alwas get on  ceph -w following "error":

"[WRN] message from mon2 was stamped 12.271440s in the future clocks 
not synchronized"

But i have synchronized my clocks 1 min befor with the same ntp-server..



----------------------------

The second error is, that I can't create / start an qemu-image on the 
ceph-filesystem. I want to start a kvm virtual machine with the 
virt-manager.

I create an image with

   "qemu-img create -f qcow2 Platte-qcow2.img 10G"

When I chose those image an want to start a virtual machine with that 
image. The virtual machine never starts. It hangs on look for the "harddisk"

Creating an Image with virt-manager doesn't work. There is after 2-3 
minutes a timout and I have to kill the virt-manager job.

Are there some experiences with this?



-----------------------------


The third error I got is the following shown in the /var/log/messages file:

http://pastebin.com/dnwVRf5F

Are those timeouts normal?



-----------------------------


The last error I got for today is the following:

http://pastebin.com/UmrCRuhq


This happend when I was creating a dummy file with:

   dd if=/dev/zero of=meineDatei count=5000000




I hope it's not too much errors in one message, but I want to show them 
all in one email for the better look if depending to each other ;)



Thanks for you help.

With best regards,

Christoph Raible

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