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> 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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