On Mon, Feb 27, 2017 at 2:37 PM, Simon Weald <simon@xxxxxxxxxxxxxx> wrote:
> I've currently having some issues making some Jessie-based Xen hosts
> talk to a Trusty-based cluster due to feature mismatch errors. Our
> Trusty hosts are using 3.19.0-80 (the Vivid LTS kernel), and our Jessie
> hosts were using the standard Jessie kernel (3.16). Volumes wouldn't
> map, so I tried the kernel from jessie-backports (4.9.2-2~bpo8+1); still
> no joy. I then tried compiling the latest kernel in the 4.9 branch
> (4.9.12) from source with the Debian kernel config - still no joy. As I
> understand it there have been a lot of changes in krbd which I should
> have pulled in when building from source - am I missing something? Some
> info about the Xen hosts:
>
> root@xen-host:~# uname -r
> 4.9.12-internal
>
> root@xen-host:~# ceph -v
> ceph version 10.2.5 (c461ee19ecbc0c5c330aca20f7392c9a00730367)
>
> root@xen-host:~# rbd map -p cinder
> volume-88188973-0f40-48a3-8a88-302d1cb5e093
> rbd: sysfs write failed
> RBD image feature set mismatch. You can disable features unsupported by
> the kernel with "rbd feature disable".
> In some cases useful info is found in syslog - try "dmesg | tail" or so.
> rbd: map failed: (6) No such device or address
>
> root@xen-host:~# dmesg | grep 'unsupported'
> [252723.885948] rbd: image volume-88188973-0f40-48a3-8a88-302d1cb5e093:
> image uses unsupported features: 0x38
>
> root@xen-host:~# rbd info -p cinder
> volume-88188973-0f40-48a3-8a88-302d1cb5e093
> rbd image 'volume-88188973-0f40-48a3-8a88-302d1cb5e093':
> size 1024 MB in 256 objects
> order 22 (4096 kB objects)
> block_name_prefix: rbd_data.c6bd3c5f705426
> format: 2
> features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
> flags:
object-map, fast-diff, deep-flatten are still unsupported.
> Do
>
> $ rbd feature disable <image-name> deep-flatten,fast-diff,object-map,exclusive-lock
>
> to disable features unsupported by the kernel client. If you are using the
> kernel client, you should create your images with
>
> $ rbd create --size <size> --image-feature layering <image-name>
>
> or add
>
> rbd default features = 3
>
> to ceph.conf on the client side. (Setting rbd default features on the
> OSDs will have no effect.)
exclusive-lock is supported starting with 4.9. The above becomes
> $ rbd feature disable <image-name> deep-flatten,fast-diff,object-map
> $ rbd create --size <size> --image-feature layering,exclusive-lock <image-name>
> rbd default features = 5
if you want it.
Thanks,
Ilya
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