[Bug 1666843] Re: Regular recoverable disconnections over SAMBA on OSX clients

[Eric Altman]

My apologies for not getting back to this. Realizing my settings here
were a little off and I wasn't getting notifications on responses.  This
is a production server with no real downtime working 7 days a week on a
continent on the other side of the world from me.

That said, the incidents have reduced significantly (about once a week
now, instead daily) when I tried creating one share and then using the
'copy' feature to define the other shares.

ZFS is a little broken right now in the newer kernel, so I'm unwilling
to update until it is well tested here in my Lab.

The network only has Mac clients, unfortunately, and while possibly a
MacOS bug I couldn't find anything in the console aside from the usual
notifications of the disconnect.

The clients are connected over one of three methods. Some are direct
connect 10GbE, some through a 1GbE switch (coming in with a 2x10GbE
LAG), others through a 10GbE switch (coming in with a 2x40GbE LAG).

I think closing this out for now and re-reporting if there is a new
instance with more metrics I can share is prudent.

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https://bugs.launchpad.net/bugs/1666843

Title:
  Regular recoverable disconnections over SAMBA on OSX clients

Status in samba package in Ubuntu:
  Triaged

Bug description:
  On Ubuntu 16.04.02 running SAMBA 4.3.11, various OS X (or macOS now)
  clients have issues with our SAMBA server which uses ZFS as the
  filesystem.

  During their regular work, it seems nothing that can be pinned down,
  every share the system is connected to will disconnect with a
  notification from macOS. This occurs on our Yosemite, El Cap, and
  Sierra clients. The systems can be remounted immediately without
  needing a reboot or resetting services.

  This happens anywhere between once and many times a day, but there is
  not a day that goes by where it doesn't happen once.

  The ZFS pool is basic but large (10 pools of 10 disks in a z2), and
  there is a 128GB of ram dedicated to caching. There have been no
  reported issues with ZFS that I can see. No errors, missing devices,
  corruption, etc... The pool is set xattr=sa.

  As you can see from the attached smb.conf, fruit is active and
  configured. We have tried countless variations of the smb.conf but
  COULD have missed something, so invite enquiries there.

  More details: The server is connected over a lagged connection to a
  switch then served to the clients. Some clients are connecting through
  a Dell switch and some through a Supermicro switch, both with their
  own LAG. This doesn't seem to matter.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: samba 2:4.3.11+dfsg-0ubuntu0.16.04.3
  ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
  Uname: Linux 4.4.0-59-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  Date: Wed Feb 22 20:45:15 2017
  InstallationDate: Installed on 2017-02-02 (19 days ago)
  InstallationMedia: ShareOS 16.04.1 2017.02.01 amd64 "ShareOS Xenial"
  NmbdLog:

  OtherFailedConnect: Yes
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SambaServerRegression: No
  SmbConfIncluded: Yes
  SmbLog:

  SourcePackage: samba
  UpgradeStatus: No upgrade log present (probably fresh install)

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