The commands shown below had successfully mapped rbd images in the past on 
kernel version 4.1.

Now I need to map one on a system running the 3.13 kernel.
Ceph version is 9.2.0.  Rados bench operations work with no problem.
I get the same error message whether I use format 1 or format 2 or 
--image-shared.
Is there something different I need to with the 3.13 kernel?

-- Tom

  # rbd create --size 1000 --image-format 1 rbd/rbddemo
  # rbd info rbddemo
    rbd image 'rbddemo':
      size 1000 MB in 250 objects
      order 22 (4096 kB objects)
      block_name_prefix: rb.0.4f08.77bd73c7
      format: 1

  # rbd map rbd/rbddemo
    rbd: sysfs write failed
    rbd: map failed: (5) Input/output error

I
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