Thank you! firefly looks like it will work.

> On Jul 12, 2016, at 10:04 AM, Sean Redmond <sean.redmo...@gmail.com> wrote:
> 
> Hi,
> 
> If your clients can support the firefly tunable you can set firefly:
> 
> 'ceph osd crush tunables firefly'
> 
> Or you can hide the warning:
> 
> mon warn on legacy crush tunables = false in [mon] section in ceph.conf.
> 
> Thanks
> 
> On Tue, Jul 12, 2016 at 5:59 PM, Mike Jacobacci <mi...@flowjo.com 
> <mailto:mi...@flowjo.com>> wrote:
> Thanks, Can I ignore this warning then?
> 
> health HEALTH_WARN
>             crush map has legacy tunables (require bobtail, min is firefly)
> 
> Cheers,
> Mike
> 
>> On Jul 12, 2016, at 9:57 AM, Sean Redmond <sean.redmo...@gmail.com 
>> <mailto:sean.redmo...@gmail.com>> wrote:
>> 
>> Hi,
>> 
>> Take a look at the docs here 
>> (http://docs.ceph.com/docs/jewel/rados/operations/crush-map/#tunables 
>> <http://docs.ceph.com/docs/jewel/rados/operations/crush-map/#tunables>) for 
>> details on what tunables work with which kernel version. and how you can 
>> change them e.g:
>> 
>> 'ceph osd crush tunables bobtail'
>> 
>> You could use a main line kernel from here (http://elrepo.org/tiki/kernel-ml 
>> <http://elrepo.org/tiki/kernel-ml>) as  4.6 is available for CentOS7
>> 
>> Thanks
>> 
>> On Tue, Jul 12, 2016 at 5:45 PM, Mike Jacobacci <mi...@flowjo.com 
>> <mailto:mi...@flowjo.com>> wrote:
>> Hi Sean,
>> 
>> Thanks for the quick response, this is what I see in dimes:
>> 
>> set mismatch, my 102b84a842a42 < server's 40102b84a842a42, missing 
>> 400000000000000
>> 
>> How can I set the tunable low enough?  And what does that mean for 
>> performance?
>> 
>> Cheers,
>> Mike
>> 
>>> On Jul 12, 2016, at 9:43 AM, Sean Redmond <sean.redmo...@gmail.com 
>>> <mailto:sean.redmo...@gmail.com>> wrote:
>>> 
>>> Hi,
>>> 
>>> It should work for you with kernel 3.10 as long as turntables are set low 
>>> enough - Do you see anything in 'dmesg'?
>>> 
>>> Thanks
>>> 
>>> On Tue, Jul 12, 2016 at 5:37 PM, Mike Jacobacci <mi...@flowjo.com 
>>> <mailto:mi...@flowjo.com>> wrote:
>>> Hi All,
>>> 
>>> Is mounting rbd only really supported in Ubuntu?  All of our servers are 
>>> CentOS 7 or RedHat 7 and since they are at Kernel 3.10, I can’t get rbd 
>>> working.  Even if I use legacy tunables or set tunables to 1/2/3… Nothing 
>>> will mount the block device.
>>> 
>>> The only answer I can find to get this working under RHEL or CentOS is to 
>>> upgrade the kernel… Doesn’t that mean RBD isn’t support for  a production 
>>> environment unless it’s Ubuntu or whatever OS supports a Kernel over 3.18?
>>> 
>>> Thanks for everyone’s help so far!
>>> 
>>> Cheers,
>>> Mike
>>> _______________________________________________
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>>> ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com>
>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com 
>>> <http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com>
>>> 
>> 
>> 
> 
> 

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