[SCM] Samba Website Repository - branch master updated

[Michael Adam]

The branch, master has been updated
       via  83705c1 Add blog post about SMB2.2 interop event from my blog.
      from  4a461a3 Announce Samba 3.5.13.

http://gitweb.samba.org/?p=samba-web.git;a=shortlog;h=master


- Log -----------------------------------------------------------------
commit 83705c149aac61b80d60944eb65ed7597b78eed8
Author: Michael Adam <ob...@samba.org>
Date:   Tue Mar 20 13:53:08 2012 +0100

    Add blog post about SMB2.2 interop event from my blog.

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+<!--#include virtual="/samba/header.html" -->
+<title>Samba - opening windows to a wider world</title>
+<!--#include virtual="/samba/global_menu.html" -->
+
+<h2>Samba Team Visits Microsoft For SMB2.2 Interop Event</h2>
+
+<p>
+<span class="meta-prep meta-prep-author">Posted on</span> <a 
href="http://blog.obnox.de/samba-team-visits-microsoft-for-smb2-2-interop-event/";
 title="1:23 pm" rel="bookmark"><span class="entry-date">March 13, 
2012</span></a> <span class="meta-sep">by</span> <span class="author vcard"><a 
class="url fn n" href="http://blog.obnox.de/author/obnox/"; title="View all 
posts by obnox">obnox</a></span>
+</p>
+
+<div class="entry-content">
+
+<p>In the week of February 27 to March 2, 2012, a few Samba developers 
accepted an invitation by Microsoft and attended an SMB2.2 testing opportunity 
at Microsofts Enterprise Engineering Center in Redmond. Jeremy Allison, Steve 
French, Volker Lendecke, Chris Hertel, Christian Ambach, Matthieu Patou and I 
found our way to Redmond with Stefan Metzmacher participating to some extent 
via IRC and mumble. For me, the event was a big success, and I am happy that I 
finally made up my mind to go there.  This is my personal report.</p>
+<p><a 
href="http://blog.obnox.de/wp-content/uploads/2012/03/20120227_222123.jpg";><img 
class="size-medium wp-image-45 aligncenter" title="ECC" 
src="http://blog.obnox.de/wp-content/uploads/2012/03/20120227_222123-300x225.jpg";
 alt="" width="300" height="225" /></a></p>
+<h3><strong>Background</strong></h3>
+<p>Microsoft will ship a new version 2.2 of the SMB protocol with Windows 8. 
Along with this, a whole new scale out clustering mode is added. The target of 
these new features is clearly server workload instead of client workload, the 
two most prominent applications being Virtualization (Hyper-V) and SQL. These 
two applications that were originally typical applications that ran from 
SAN-Storage, can now run directly from SMB2.2, and they can go even further 
when an RDMA adapter is installed, thanks to the new RDMA support in SMB2.2 
called SMB Direct. Other intersting features in SMB2.2 are multi-channel 
sessions and persistent file handles that can survive server failures without 
data loss.</p>
+<p>These new features were first presented at the <a title="Storage Developer 
Conference" href="http://www.snia.org/events/storage-developer2011"; 
target="_blank">Storage Developer Conference</a> in September 2011.</p>
+<p>There are preview versions of the documents for these new features 
available from the <a title="msdn library - open specifications" 
href="http://msdn.microsoft.com/en-us/library/dd208104%28v=prot.10%29.aspx"; 
target="_blank">msdn library</a>, but they are not complete yet and partly 
still subject to change. Since February 29, the beta version of Windows 8 can 
be tested. While the client is freely available, the server variant is only 
available via MSDN subscriptions. Before this date, only a preview from 
September 2011 was available that did not yet support many of the announced 
features.</p>
+<h3>The <strong>Test Setup</strong></h3>
+<p>Microsoft had established two test environments for us with a domain and 
Windows 8 clients equipped with some test suites. One network contained a 
Windows 8 cluster server installation, and in the other network was intended 
for us to integrate our own server implementations to run Microsoft&#8217;s 
test suite against.</p>
+<p>After we had trouble accessing our test network the first day, it worked 
nicely from the second day on and gave us the opportunity to run tests against 
Windows 8 beta. It was especially useful to run tests against a fully installed 
Windows 8 cluster.</p>
+<h3>Signing</h3>
+<p>Since the beta release, Windows 8 sports a new signing algorithm, aes-cmac, 
that had not been available in earlier Window 8 previews. In a joint effort 
with Jeremy and Metze, we were able to fix the last bugs in the code that Metze 
had written in the last days before the event (by just looking at the docs). So 
we now have a working signing code against Windows 8, (client and server side), 
which we did not have before.</p>
+<h3>Persistent Handles &#8211; Test Suites</h3>
+<p>My focus for the event was on durable (SMB2.0) and persistent (SMB2.2) file 
handles and clustering features. I gained a better understanding of persistent 
file handles and I was able to extend our testsuites and add precision to them. 
I also spotted some bugs in the documentation and a bug in Windows 8 
durable-handle-vs-oplock behaviour (a regression from Windows 2008R2). I am 
still working on extending our testsuites with respect to durable and 
persistent handles.</p>
+<p>It was extremely useful to have several of the core engineers from 
Microsoft available during the test lab for discussions about product behaviour 
and the documentation. It helped me to improve my understanding of the new 
clustering concepts and to deepen my knowledge of durable and persistent file 
handles.</p>
+<h3>Persistent Handles &#8211; Server Hacking</h3>
+<p>On the server side, Christian set up a Samba-CTDB cluster in the partner 
environment and we installed the code from the durable handle 
work-in-progress-branch that Metze and I are working on, and we started hacking 
some 2.2 features into it. In the end, we were able to talk SMB 2.2 with the 
client and offered persistent handles &#8211; in a somewhat faked up manner, 
not being able to give the full set of guarantees attached to persistent 
handles.</p>
+<p>The nice visible success was that we were able to do a transparent node 
failover of the client copying a dvd image to the samba cluster. We ran 
&#8220;ctdb disable&#8221; on the connected node and the client switched over 
to the other node and kept copying. In the end, the dvd image was complete and 
its md5sum correct!</p>
+<p>You can see this as a record-my-desktop video <a title="SMB2.2 Persistent 
Failover" 
href="http://www.samba.org/~obnox/videos/smb22-persistent-failover-20120302.ogv";
 target="_blank">here</a>.</p>
+<p><strong>Note</strong>: The new copy progress bar is a <em>really</em> nifty 
feature in Windows 8.  <img 
src='http://blog.obnox.de/wp-includes/images/smilies/icon_wink.gif' alt=';-)' 
class='wp-smiley' /> </p>
+<p>As a background, it is important to know that in the Windows 8 clustering, 
it is the <em>client</em> that implements most of the logic for failover 
scenarios. The client notices the server outage and reconnects to the new node 
consciously. It then does a replay of the last write that failed. So the 
additions on the server side for this first success were resonably small after 
having some support (still work-in-progress support) for durable handles.</p>
+<h3>Summary</h3>
+<p>Summing up, it was a very successful and productive event. I would also 
like to emphasize that the Microsoft folks have really been very cooperative, 
and they are also happily accepting comments on documentation and product 
behaviour.</p>
+<p>The outcome for me is that we are on the right track with our work on 
durable handles, and it is good to see that some of it is already working. 
There still is a lot of work needed to get the things right, and we have for 
instance not even seriously touched RDMA yet, but we have a much clearer 
picture now. The good bit that has been confirmed now, is that the logic of the 
new Windows clustering is largely in the client. And we were able to 
demonstrate that we have a chance to take advantage of it in our CTDB clusters 
without having to throw the established CTDB-clustering away and implement 
something completely  different.</p>
+
+</div><!-- .entry-content -->
+
+
+<p>This article was originally posted to
+<a 
href="http://blog.obnox.de/samba-team-visits-microsoft-for-smb2-2-interop-event/";
+title="Samba Team Visits Microsoft For SMB2.2 Interop Event">obnox' 
blog</a>.</p>
+
+<div align="center">Samba - <i>Opening Windows to a Wider World</i></div>
+
+<!--#include virtual="/samba/footer.html" -->


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