On Wed, Dec 2, 2015 at 12:15 PM, MinhTien MinhTien
<tientienminh080...@gmail.com> wrote:
> Hi all,
>
> When I map block device in client kernel 3.10.93-1.el6.elrepo.x86_64, i get
> error:
>
> libceph: mon0 ip:6789 feature set mismatch, my 4a042a42 < server's
> 184a042a42, missing 1800000000
> libceph: mon0 ip:6789 socket error on read
>
> I used ceph version 0.87.2
>
> I tried to find the problem in this page:
> http://cephnotes.ksperis.com/blog/2014/01/21/feature-set-mismatch-error-on-ceph-kernel-client
> but I not saw infomation for my error.
>
> Please help me,
That's OSD_CACHEPOOL and CRUSH_V2 - you must have tiering enabled on
one of your pools (not necessarily the pool you are trying to map an
image out of). To make it work with 3.10 you'll need to make sure
*none* of the pools have tiering enabled and make sure your crushmap
doesn't have any indep or SET_* steps.
The alternative is upgrading your kernel to at least 3.14.
Thanks,
Ilya
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