[PATCH] multi-channel whatsnew

Michael Adam obnox at samba.org
Tue Mar 15 21:02:18 UTC 2016

Hi Karo, and all,

attached find the patch for v4-4-0 WHATSNEW that adds
the details about the experimental multi-channel feature.

The bug to backport the enablement switch is this:


I know it's kind of late, but since the rc is not out yet,
and this was essentially discussed before, here is my input.

If it's too late, then so be it. :-)

Thanks - Michael
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From 15c37d6812088020d9d14355fc699788a5dc7b86 Mon Sep 17 00:00:00 2001
From: Michael Adam <obnox at samba.org>
Date: Tue, 15 Mar 2016 21:56:44 +0100
Subject: [PATCH] WHATSNEW: document the experimental smb3-multi-channel

Signed-off-by: Michael Adam <obnox at samba.org>
 WHATSNEW.txt | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/WHATSNEW.txt b/WHATSNEW.txt
index 7011c12..6dd74ae 100644
--- a/WHATSNEW.txt
+++ b/WHATSNEW.txt
@@ -189,6 +189,53 @@ CTDB changes
 * All CTDB current manual pages are now correctly installed
+SMB3 Multi-Channel
+Samba 4.4.0 adds *experimental* support for SMB3 Multi-Channel.
+Multi-Channel is an SMB3 protocol feature that allows the client
+to bind multiple transport connections into one authenticated
+SMB session. This allows for increased fault tolerance and
+throughput. The client chooses transport connections as reported
+by the server and also chooses over which of the bound transport
+connections to send traffic. I/O operations for a given file
+handle can span multiple network connections this way.
+An SMB multi-channel session will be valid as long as at least
+one of its channels are up.
+In Samba, multi-channel can be enabled by setting the new
+smb.conf option "server multi channel support" to "yes".
+It is disabled by default.
+Samba has to report interface speeds and some capabilities to
+the client. On Linux, Samba can auto-detect the speed of an
+interface. But to support other platforms, and in order to be
+able to manually override the detected values, the "interfaces"
+smb.conf option has been given an extended syntax, by which an
+interface specification can additionally carry speed and
+capability information. The extended syntax looks like this
+for setting the speed to 1 gigabit per second:
+    interfaces =;speed=1000000000
+This extension should be used with care and are mainly intended
+for testing. See the smb.conf manual page for details.
+CAVEAT: While this should be working without problems mostly,
+there are still corner cases in the treatment of channel failures
+that may result in DATA CORRUPTION when these race conditions hit.
+It is hence
+at this stage. This situation can be expected to improve during
+the life-time of the 4.4 release. Feed-back from test-setups is
+highly welcome.
@@ -228,6 +275,8 @@ smb.conf changes
   --------------		-----------		-------
   aio max threads               New                     100
   ldap page size		Changed default		1000
+  server multi channel support	New			No
+  interfaces			Extended syntax

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