samba - May 2018 - AD dropping connection from storage cluster

Hi everyone.

Since yesterday we started experiencing very weird problem with our samba
AD server and our Isilon storage. This seems to affect only the storage, as
our Windows workstations are fine.
Suddenly the storage lost connectivity to the AD and so it's unable to
provide access to the SMB shares. I've tried rejoining without success and
whatnot.
Today I even created second AD dc for the sake of tests (using Fedora just
for the newer samba + bind packages). After fiddling around it eventually
started working and kept the connectivity for about 30-40 min. At that
point suddenly it dropped it again. One thing I noticed is that changing
any of the AD settings in the OneFS management page instantly get the
connection back for another 30 min.

I know, it may look as OneFS issue, but since Samba is involved as well I
decided to reach for some help or pointers for debugging this.

On Sat, 19 May 2018 22:53:25 +0100
Zdravko Zdravkov via samba <samba at lists.samba.org> wrote:
> Hi everyone.
> 
> Since yesterday we started experiencing very weird problem with our
> samba AD server and our Isilon storage. This seems to affect only the
> storage, as our Windows workstations are fine.
> Suddenly the storage lost connectivity to the AD and so it's unable to
> provide access to the SMB shares. I've tried rejoining without
> success and whatnot.
> Today I even created second AD dc for the sake of tests (using Fedora
> just for the newer samba + bind packages). After fiddling around it
> eventually started working and kept the connectivity for about 30-40
> min. At that point suddenly it dropped it again. One thing I noticed
> is that changing any of the AD settings in the OneFS management page
> instantly get the connection back for another 30 min.
> 
> I know, it may look as OneFS issue, but since Samba is involved as
> well I decided to reach for some help or pointers for debugging this.
This does sound like it has nothing to do with Samba, but the only way
to prove it, is to turn up the logging everywhere and see what pops up.

Rowland

On Sat, 2018-05-19 at 22:53 +0100, Zdravko Zdravkov via samba
wrote:
> Hi everyone.
> 
> Since yesterday we started experiencing very weird problem with our samba
> AD server and our Isilon storage. This seems to affect only the storage, as
> our Windows workstations are fine.
> Suddenly the storage lost connectivity to the AD and so it's unable to
> provide access to the SMB shares. I've tried rejoining without success
and
> whatnot.
> Today I even created second AD dc for the sake of tests (using Fedora just
> for the newer samba + bind packages). After fiddling around it eventually
> started working and kept the connectivity for about 30-40 min. At that
> point suddenly it dropped it again. One thing I noticed is that changing
> any of the AD settings in the OneFS management page instantly get the
> connection back for another 30 min.
> 
> I know, it may look as OneFS issue, but since Samba is involved as well I
> decided to reach for some help or pointers for debugging this.
Grab a network trace, particularly as the point where it fails.

Andrew Bartlett

-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba