Re: [ceph-users] Kernel Versions for KVM Hypervisors

[Ilya Dryomov]

On Thu, Oct 20, 2016 at 2:45 PM, David Riedl  wrote:
> Hi cephers,
>
> I want to use the newest features of jewel on my cluster. I already updated
> all kernels on the OSD nodes to the following version:
> 4.8.2-1.el7.elrepo.x86_64.
>
> The KVM hypervisors are running the CentOS 7 stock kernel (
> 3.10.0-327.22.2.el7.x86_64 )
>
> If I understand it correctly, libvirt/qemu/librbd don't use the kernel for
> communication with ceph. At least there is no kernel layer shown in this
> diagram: http://docs.ceph.com/docs/master/rbd/libvirt/

Correct.

>
> The ceph packages are already updated on the hypervisors. On top on all this
> there is Openstack, if that's important at all.
>
>
> My question is: Do I need to update the kernels of the hypervisors if I only
> use libvirt as a base?

No - if all you are doing is qemu/librbd, the stock kernel is good
enough.

Thanks,

Ilya
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[ceph-users] Kernel Versions for KVM Hypervisors

[David Riedl]

Hi cephers,

I want to use the newest features of jewel on my cluster. I already 
updated all kernels on the OSD nodes to the following version: 
4.8.2-1.el7.elrepo.x86_64.


The KVM hypervisors are running the CentOS 7 stock kernel ( 
3.10.0-327.22.2.el7.x86_64 )


If I understand it correctly, libvirt/qemu/librbd don't use the kernel 
for communication with ceph. At least there is no kernel layer shown in 
this diagram: http://docs.ceph.com/docs/master/rbd/libvirt/


The ceph packages are already updated on the hypervisors. On top on all 
this there is Openstack, if that's important at all.



My question is: Do I need to update the kernels of the hypervisors if I 
only use libvirt as a base?



Regards

David
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