[Ceph 에러] rbd: sysfs write failed rbd: map failed: (6) No such device or address

# rbd create client01/vm_disk01 --size 4096

# rbd list client01

vm_disk01

# rbd info client01/vm_disk01

rbd image 'vm_disk01':

size 4096 MB in 1024 objects

order 22 (4096 kB objects)

block_name_prefix: rbd_data.10282ae8944a

format: 2

features: layering, exclusive-lock, object-map, fast-diff, deep-flatten

flags: 

root@ceph:~# rbd map client01/vm_disk01

rbd: sysfs write failed

rbd: map failed: (6) No such device or address

root@ceph:~# rbd create client01/vm_disk02 --size 2G --image-feature layering

root@ceph:~# rbd info client01/vm_disk02

rbd image 'vm_disk02':

size 2048 MB in 512 objects

order 22 (4096 kB objects)

block_name_prefix: rbd_data.10322ae8944a

format: 2

features: layering

flags: 

root@ceph:~# rbd map client01/vm_disk02

/dev/rbd0