Re: Realistic Ceph Client OS

[Mike Jacobacci <mikej@xxxxxxxxxx>]

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.redmond1@xxxxxxxxx> wrote:

Hi,

Take a look at the docs here (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) as  4.6 is available for CentOS7

Thanks

On Tue, Jul 12, 2016 at 5:45 PM, Mike Jacobacci <mikej@xxxxxxxxxx> 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.redmond1@xxxxxxxxx> 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 <mikej@xxxxxxxxxx> 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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