If you have no control over what kernel the clients are going to use, then I wouldn't even consider using the kernel driver for the clients. For me, I would do anything to maintain the ability to use the object map which would require the 4.9 kernel to use with the kernel driver. Because of this and similar improvements to ceph that the kernel is requiring newer and newer versions to utilize, I've become a strong proponent of utilizing the fuse, rgw, and librados/librbd client options to keep my clients in feature parity with my cluster's ceph version.
On Fri, Jun 23, 2017 at 11:50 AM Massimiliano Cuttini <max@xxxxxxxxxxxxx> wrote:
Not all server are real centOS servers.
Some of them are dedicated distribution locked at 7.2 with locked kernel
fixed at 3.10.
Which as far as I can understand need CRUSH_TUNABLES2 and not even 3!
http://cephnotes.ksperis.com/blog/2014/01/21/feature-set-mismatch-error-on-ceph-kernel-client
So what are you suggest to sacrifice?
Kernel-RBD or CRUSH_TUNABLE > 2?
Il 23/06/2017 14:51, Jason Dillaman ha scritto:
> CentOS 7.3's krbd supports Jewel tunables (CRUSH_TUNABLES5) and does
> not support NBD since that driver is disabled out-of-the-box. As an
> alternative for NBD, the goal is to also offer LIO/TCMU starting with
> Luminous and the next point release of CentOS (or a vanilla >=4.12-ish
> kernel).
>
> On Fri, Jun 23, 2017 at 5:31 AM, Massimiliano Cuttini <max@xxxxxxxxxxxxx> wrote:
>> Dear all,
>>
>> running all server and clients a centOS release with a kernel 3.10.* I'm
>> facing this choiche:
>>
>> sacrifice TUNABLES and downgrade all the cluster to
>> CEPH_FEATURE_CRUSH_TUNABLES3 (which should be the right profile for jewel on
>> old kernel 3.10)
>> sacrifice KERNEL RBD and map Ceph by NBD
>>
>> Which one should I sacrifice? And why?
>> Let me know your througth, pro & cons.
>>
>>
>> Thanks,
>> Max
>>
>>
>>
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users@xxxxxxxxxxxxxx
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
>
>
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