I find this message in dmesg:
[83090.212918] libceph: mon0 192.168.159.128:6789 feature set mismatch, my 
4a042a42 < server's 2004a042a42, missing 20000000000


According to 
"http://cephnotes.ksperis.com/blog/2014/01/21/feature-set-mismatch-error-on-ceph-kernel-client";,
this could mean that I need to upgrade kernel client up to 3.15 or disable 
tunable 3 features.
Our cluster is not convenient to upgrade. 
Could you tell me how to disable tunable 3 features?


Thanks!


Kind Regards,
Haitao Wang

At 2016-06-22 12:33:42, "Brad Hubbard" <bhubb...@redhat.com> wrote:
>On Wed, Jun 22, 2016 at 1:35 PM, 王海涛 <wht...@163.com> wrote:
>> Hi All
>>
>> I'm using ceph-10.1.1 to map a rbd image ,but it dosen't work ,the error
>> messages are:
>>
>> root@heaven:~#rbd map rbd/myimage --id admin
>> 2016-06-22 11:16:34.546623 7fc87ca53d80 -1 WARNING: the following dangerous
>> and experimental features are enabled: bluestore,rocksdb
>> 2016-06-22 11:16:34.547166 7fc87ca53d80 -1 WARNING: the following dangerous
>> and experimental features are enabled: bluestore,rocksdb
>> 2016-06-22 11:16:34.549018 7fc87ca53d80 -1 WARNING: the following dangerous
>> and experimental features are enabled: bluestore,rocksdb
>> rbd: sysfs write failed
>> rbd: map failed: (5) Input/output error
>
>Anything in dmesg, or anywhere, about "feature set mismatch" ?
>
>http://cephnotes.ksperis.com/blog/2014/01/21/feature-set-mismatch-error-on-ceph-kernel-client
>
>>
>> Could someone tell me what's wrong?
>> Thanks!
>>
>> Kind Regards,
>> Haitao Wang
>>
>>
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users@lists.ceph.com
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
>
>
>
>-- 
>Cheers,
>Brad
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