On Fri, Mar 23, 2018 at 2:18 PM, <ceph@xxxxxxxxxxxxxx> wrote:
> On 03/23/2018 12:14 PM, Ilya Dryomov wrote:
>> luminous cluster-wide feature bits are supported since kernel 4.13.
>
> ?
>
> # uname -a
> Linux abweb1 4.14.0-0.bpo.3-amd64 #1 SMP Debian 4.14.13-1~bpo9+1
> (2018-01-14) x86_64 GNU/Linux
> # rbd info truc
> rbd image 'truc':
> size 20480 MB in 5120 objects
> order 22 (4096 kB objects)
> block_name_prefix: rbd_data.9eca966b8b4567
> format: 2
> features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
> flags:
> # rbd map truc
> rbd: sysfs write failed
> RBD image feature set mismatch. You can disable features unsupported by
> the kernel with "rbd feature disable pool/truc object-map fast-diff
> deep-flatten".
> In some cases useful info is found in syslog - try "dmesg | tail".
> rbd: map failed: (6) No such device or address
> # dmesg | tail -1
> [1108045.667333] rbd: image truc: image uses unsupported features: 0x38
Those are rbd image features. Your email also mentioned "libcephfs via
fuse", so I assumed you had meant cluster-wide feature bits.
Thanks,
Ilya
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