[Sheepdog] Configuring simple cluster on CentOS 5.5 x86_64

[Yuriy Kohut]

Hi,

I'm using the following 'Getting Started' guide to configure simple cluster:
http://www.osrg.net/sheepdog/usage.html

I have configured cluster on 1 node/box, so the first questions are:
Can I configure cluster on single node (1 box) under CentOS 5.5 x86_64 ? 
Is it required at least 3 nodes/boxes ... ?

I have faced with the following issue on my single-node cluster. I have rebooted the box after my first image creation. The following done for that:
- corosync is up and running
udp        0      0 192.168.128.195:5404        0.0.0.0:*                               3541/corosync       
udp        0      0 192.168.128.195:5405        0.0.0.0:*                               3541/corosync       
udp        0      0 226.94.1.1:5405             0.0.0.0:*                               3541/corosync 

- sheep is up and running
tcp        0      0 0.0.0.0:7000                0.0.0.0:*                   LISTEN      3561/sheep

- cluster is formatted with 1 copy only
#collie cluster format --copies=1

- the image with prelocated data is created
# qemu-img create sheepdog:test0 -o preallocation=data 4G


So after such siple steps I got:
# collie vdi list
  name        id    size    used  shared    creation time   vdi id
------------------------------------------------------------------
  test0        1  4.0 GB  4.0 GB  0.0 MB 2010-10-15 12:42   fd34af


Then I rebooted the box, and no image(s) are available for me after box came back. The vdi list just show nothing:
# collie vdi list
  name        id    size    used  shared    creation time   vdi id
------------------------------------------------------------------

and 'collie vdi list' never ends ...
corosync and sheep are still running.


Could somebody assist me with that.
Thanks
---
Yura