Hi,
Thanks for getting back to me. It turns out that setting crush tunables to
“optimal” profile caused the problem I encountered. I set it back to “default”
and specified “layering” as the only image-feature as you suggested fixed the
problem. Thanks again.
Steven
> On May 13, 2016, at 4:39 PM, Ilya Dryomov wrote:
>
> On Fri, May 13, 2016 at 10:11 PM, Steven Hsiao-Ting Lee
> wrote:
>> Hi,
>>
>> I’m playing with Jewel and discovered format 1 images have been deprecated.
>> Since the rbd kernel module in CentOS/RHEL 7 does not yet support format 2
>> images, how do I access RBD images created in Jewel from CentOS/RHEL 7
>> clients? Thanks!
>
> It does support format 2 images. What it doesn't support is the extra
> features enabled by default in jewel.
>
>> Do
>>
>>$ rbd feature disable
>> 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 --image-feature layering
>>
>> or add
>>
>>rbd default features = 3
>>
>> to ceph.conf on the client side. (Setting rbd default features on the
>> OSDs will have no effect.)
>
> Thanks,
>
>Ilya
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