group.of.nepali.translators team mailing list archive

[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1728739

Title:
  Attempt to map rbd image from ceph jewel/luminous hangs

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Triaged

Bug description:
  [Impact]

  Attempting to map an rbd image using the 4.4 LTS (Xenial) kernel
  client from a Jewel or Luminous Ceph cluster with optimal tunables
  fails due to feature set mismatch.

  The Jewel release of Ceph introduced a new set of CRUSH tunables.
  These tunables were first introduced in the 4.5 Linux kernel and are
  thus not available in the 16.04 LTS 4.4 Linux Kernel. Attempting to
  map RBD images as block devices will fail due to not being able to
  understand these new tunables:

  (from kern.log)

  Oct 30 21:19:05 ceph-7 kernel: [  815.674075] Key type ceph registered
  Oct 30 21:19:05 ceph-7 kernel: [  815.676862] libceph: loaded (mon/osd proto 15/24)
  Oct 30 21:19:05 ceph-7 kernel: [  815.678970] rbd: loaded (major 251)
  Oct 30 21:19:05 ceph-7 kernel: [  815.689556] libceph: mon0 10.5.0.19:6789 feature set mismatch, my 106b84a842a42 < server's 40106b84a842a42, missing 400000000000000
  Oct 30 21:19:05 ceph-7 kernel: [  815.692897] libceph: mon0 10.5.0.19:6789 missing required protocol features

  Support for the new CRUSH tunables were added in upstream kernel 4.5
  in http://www.spinics.net/lists/ceph-devel/msg28421.html.

  [Test Case]

  1. Deploy a Jewel or Luminous Ceph cluster.
  2. Create rbd image suitable for the kernel client:
    $ rbd create --pool rbd --image-feature layering --size 1G test
  3. Map the rbd image to the local server:
    $ rbd map --pool rbd test

  [Regression Potential]

  Minimal. Code is limited to kernel rbd driver and new code should
  primarily affect clients connecting to clusters with the new tunables
  options.

  [Additional Info]

  A workaround is to change the crush tunables configured for the Ceph
  cluster to a legacy version (hammer or lower) via:

  $ ceph osd crush tunables hammer

  However, changing the tunables to hammer fails to allow the cluster to take advantage of newer placement strategies which reduces the amount of data movement throughout the cluster.
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Oct 31 01:23 seq
   crw-rw---- 1 root audio 116, 33 Oct 31 01:23 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  DistroRelease: Ubuntu 16.04
  Ec2AMI: ami-00000001
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-98-generic root=UUID=d7006b2f-ace6-464d-8b21-17180b3ed360 ro console=tty1 console=ttyS0
  ProcVersionSignature: Ubuntu 4.4.0-98.121-generic 4.4.90
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-98-generic N/A
   linux-backports-modules-4.4.0-98-generic  N/A
   linux-firmware                            N/A
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial ec2-images
  Uname: Linux 4.4.0-98-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: 1.10.1-1ubuntu1~cloud0
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-zesty
  dmi.modalias: dmi:bvnSeaBIOS:bvr1.10.1-1ubuntu1~cloud0:bd04/01/2014:svnOpenStackFoundation:pnOpenStackNova:pvr15.0.6:cvnQEMU:ct1:cvrpc-i440fx-zesty:
  dmi.product.name: OpenStack Nova
  dmi.product.version: 15.0.6
  dmi.sys.vendor: OpenStack Foundation

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