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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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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:
Incomplete
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.
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