Ken,
Thanks for the reply.
It's really good news, that RBD is considered strategic. I'm guessing I can use the firefly kernel modules on a giant ceph system, as long as RHEL7 is in play? No serious changes in that code from firefly to giant (I'm
hoping)?
Regards,
-don-
On Thursday, February 5, 2015 10:05 AM, Ken Dreyer <kdreyer@xxxxxxxxxx> wrote:
On 02/05/2015 08:55 AM, Don Doerner wrote:
> I have been using Ceph to provide block devices for various, nefarious
> purposes (mostly testing ;-). But as I have worked with various Linux
> distributions (RHEL7, CentOS6, CentOS7) and various Ceph releases
> (firefly, giant), I notice that the onlycombination for which I seem
> able to find the needed kernel modules (rbd, libceph) is RHEL7-firefly.
Hi Don,
The RBD kernel module is not deprecated; quite the opposite in fact.
A year ago things were a bit rough regarding supporting the Ceph kernel
modules on RHEL 6 and 7. All Ceph kernel module development goes
upstream first into Linus' kernel tree, and that tree is very different
than what ships in RHEL 6 (2.6.32 plus a lot of patches) and RHEL 7
(3.10.0 plus a lot of patches). This meant that it was historically much
harder for the Ceph developer community to integrate what was going on
upstream with what was happening in the downstream RHEL kernels.
Currently, Red Hat's plan is to ship rbd.ko and some of the associated
firefly userland bits in RHEL 7.1. You mention that you've been testing
on RHEL 7, so I'm guessing you're got a RHEL subscription. As it turns
out, you can try the new kernel package out today in the RHEL 7.1 Beta
that's available to all RHEL subscribers. It's a beta, so please open
support requests with Red Hat if you happen to hit bugs with those new
packages.
Unfortunately CentOS does not rebuild and publish the public RHEL Betas,
so for CentOS 7, you'll have to wait until RHEL 7.1 reaches GA and
CentOS 7.1 rebuilds it. (I suppose you could jump ahead of the CentOS
developers here and rebuild your own kernel package and ceph userland if
you're really eager... but you're really on your own there :)
- Ken
> I have been using Ceph to provide block devices for various, nefarious
> purposes (mostly testing ;-). But as I have worked with various Linux
> distributions (RHEL7, CentOS6, CentOS7) and various Ceph releases
> (firefly, giant), I notice that the onlycombination for which I seem
> able to find the needed kernel modules (rbd, libceph) is RHEL7-firefly.
Hi Don,
The RBD kernel module is not deprecated; quite the opposite in fact.
A year ago things were a bit rough regarding supporting the Ceph kernel
modules on RHEL 6 and 7. All Ceph kernel module development goes
upstream first into Linus' kernel tree, and that tree is very different
than what ships in RHEL 6 (2.6.32 plus a lot of patches) and RHEL 7
(3.10.0 plus a lot of patches). This meant that it was historically much
harder for the Ceph developer community to integrate what was going on
upstream with what was happening in the downstream RHEL kernels.
Currently, Red Hat's plan is to ship rbd.ko and some of the associated
firefly userland bits in RHEL 7.1. You mention that you've been testing
on RHEL 7, so I'm guessing you're got a RHEL subscription. As it turns
out, you can try the new kernel package out today in the RHEL 7.1 Beta
that's available to all RHEL subscribers. It's a beta, so please open
support requests with Red Hat if you happen to hit bugs with those new
packages.
Unfortunately CentOS does not rebuild and publish the public RHEL Betas,
so for CentOS 7, you'll have to wait until RHEL 7.1 reaches GA and
CentOS 7.1 rebuilds it. (I suppose you could jump ahead of the CentOS
developers here and rebuild your own kernel package and ceph userland if
you're really eager... but you're really on your own there :)
- Ken
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