Ilya,
Many folks hit this and its quite difficult since the error is not properly printed out(unless one scans syslogs), Is it possible to default the feature to
the one that kernel supports or its not possible to handle that case?Many folks hit this and its quite difficult since the error is not properly printed out(unless one scans syslogs), Is it possible to default the feature to
On Mon, Feb 27, 2017 at 5:59 AM, Ilya Dryomov <idryomov@xxxxxxxxx> wrote:
object-map, fast-diff, deep-flatten are still unsupported.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 (c461ee19ecbc0c5c330aca20f7392c 9a00730367)
>
> 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:
> 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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