[openstack-dev] Required Ceph rbd image features

Fox, Kevin M Kevin.Fox at pnnl.gov
Wed Jun 21 19:31:12 UTC 2017

Anyone else seen a problem with kernel rbd when ceph isn't fully up when an kernel rbd mount is attempted?

the mount blocks as it should, but if ceph takes too long to start, it enventually enters a D state forever even though ceph comes up happpy. Its like it times out and stops trying. Only a forced reboot will solve it. :/

This a known issue?


From: Jason Dillaman [jdillama at redhat.com]
Sent: Wednesday, June 21, 2017 12:07 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] Required Ceph rbd image features

On Wed, Jun 21, 2017 at 12:32 PM, Jon Bernard <jobernar at redhat.com> wrote:
> I suspect you'd want to enable layering at minimum.

I'd agree that layering is probably the most you'd want to enable for
krbd-use cases as of today. The v4.9 kernel added support for
exclusive-lock, but that probably doesn't provide much additional
benefit at this point. The striping v2 feature is still not supported
by krbd for non-basic stripe count/unit settings.

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