John, in block device quick start (http://ceph.com/docs/master/start/quick-rbd/)
"sudo rbd map foo --pool rbd --name client.admin" maps the image to /dev/rbd0 here (centos 6.3/bobtail) so the subsequent "4. Use the block device. In the following example, create a file system. sudo mkfs.ext4 -m0 /dev/rbd/rbd/foo" should end with "/dev/rbd0" instead of "/dev/rbd/rbd/foo". -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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