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
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