[ceph-users] CTDB Cluster Samba on Cephfs

Simo idra at samba.org
Wed Apr 3 16:26:05 MDT 2013

On 04/03/2013 05:42 PM, Jeremy Allison wrote:
> On Wed, Apr 03, 2013 at 03:53:58PM -0500, Sam Lang wrote:
>> On Thu, Mar 28, 2013 at 6:32 AM, Kai Blin <kai at samba.org> wrote:
>>> Hash: SHA1
>>> On 2013-03-28 09:16, Volker Lendecke wrote:
>>>> On Wed, Mar 27, 2013 at 10:43:36PM -0700, Matthieu Patou wrote:
>>>>> On 03/27/2013 10:41 AM, Marco Aroldi wrote:
>>>>>> Hi list, I'm trying to create a active/active Samba cluster on
>>>>>> top of Cephfs I would ask if Ceph fully supports CTDB at this
>>>>>> time.
>>>>> If I'm not wrong Ceph (even CephFS) do not support exporting a
>>>>> block device or mounting the same FS more than once whereas CTDB
>>>>> explicitly require that you have a distributed filesystem where
>>>>> the same filesystem is mounted across all the nodes.
>>>> Is that true? I thought Ceph was one of the cluster filesystems
>>>> doing just that. What is Ceph if not a cluster file system?
>>> There's some problem with mounting the in-kernel cephfs driver on
>>> systems running the osd, iirc. I had to use the fuse-based driver to
>>> mount, which obviously is not too great, speed-wise.
>>> See http://ceph.com/docs/master/faq/#try-ceph for a better description
>>> of the issue.
>> Just to let folks know, we have a ceph vfs driver for samba that we
>> are testing out now.  We're planning to resolve a few of the bugs that
>> we're seeing presently with smbtorture, and send a pull request to the
>> samba repo.  If anyone wants to help with testing, let us know.  The
>> changes currently reside in the ceph branch of
>> http://github.com/ceph/samba.
> One thing I noticed. Returning a struct ceph_dir_result *
> cast to a DIR * struct won't work in 4.0.x as we expect
> dirfd(DIR *) to return a valid file descriptor.
This sounds like a bug in 4.0.x, we should add a VFS layer operation for 
dirfd if we do not have it already.


> More as I look at it.
> Jeremy.

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