[Bug 1578484] Re: ceph rbd map in ubuntu 16.04 fails with map failed: (6) No such device or address

[James Page]

The mismatch between backend (ceph) and kernel features does appear to
be a bit of a problem; that said it is avoidable by configuration, so
marking as 'Low' for now; it might be nice to try to align the default
so that everything in Ubuntu just DTRT but that might not be easily
achievable without breaking something else.

** Changed in: ceph (Ubuntu)
   Importance: Undecided => Low

** Changed in: ceph (Ubuntu)
       Status: Confirmed => Triaged

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Title:
  ceph rbd map in ubuntu 16.04 fails with map failed: (6) No such device
  or address

Status in ceph package in Ubuntu:
  Triaged

Bug description:
  Ubuntu 16.04 with ceph cluster ok

  root at x4600:~# ceph --version

  ceph version 10.1.2 (4a2a6f72640d6b74a3bbd92798bb913ed380dcd4)

  
  root at x4600:~# ceph status
      cluster 9ed0acb4-425c-4d09-a693-471ed6391d6b
       health HEALTH_WARN
              too many PGs per OSD (490 > max 300)
       monmap e2: 3 mons at {cephmon1=10.10.25.105:6789/0,cephmon2=10.10.25.106:6789/0,cephmon3=10.10.25.107:6789/0}
              election epoch 8, quorum 0,1,2 cephmon1,cephmon2,cephmon3
       osdmap e254: 46 osds: 46 up, 46 in
              flags sortbitwise
        pgmap v141576: 11280 pgs, 13 pools, 278 MB data, 291 objects
              232 GB used, 85424 GB / 85656 GB avail
                 11280 active+clean

  
  rbd create is ok:

  root at x4600:~# rbd create rbd/pippo --size 10240 --image-format 2

  
  rbd ls is ok:

  root at x4600:~# rbd ls
  pippo

  
  rbd map fails

  root at x4600:~# rbd map rbd/pippo
  rbd: sysfs write failed
  rbd: map failed: (6) No such device or address

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