Ceph

This bug almost the same as this bug:http://tracker.newdream.net/issues/1707
I followed the instruction:http://ceph.newdream.net/docs/latest/ops/install/mkcephfs/ to install ceph and configure the cluster on Debian Squeeze 6.0.3 on all nodes.
After I run the command:"mkcephfs - a - c mycluster.conf - k mycluster.keyring"
I did not get any errors, but when I run the command:"ceph - k mycluster.keyring -c mycluster.conf health".
The result is:

2012-02-27 03:20:58.064745 mon < - [health]
2012-02-27 03:20:58.065714 mon.0 -> 'HEALTH_ERR no osds' (0)

Then I check the log, found this error:

_2012-02-27 00:47:05.909476 7f0679f73780 filestore(/ceph/osd.0) error (17) File exists not handled on operation 20 (op num 1, counting from 1)
2012-02-27 00:47:05.909485 7f0679f73780 filestore(/ceph/osd.0) unexpected error code
2012-02-27 00:47:05.909503 7f0679f73780 filestore(/ceph/osd.0) transaction dump:
1: mkcoll meta
2: write meta 23c2fcde/osd_superblock/0 0~106 (106)
3: mkcoll temp

os/FileStore.cc: In function 'unsigned int FileStore::_do_transaction(ObjectStore::Transaction&, uint64_t)' thread 7f0679f73780 time 2012-02-27 00:47:05.909526
os/FileStore.cc: 2475: FAILED assert(0 == "unexpected error")
ceph version 0.42.2 (commit:732f3ec94e39d458230b7728b2a936d431e19322)_

the full log is here: