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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hello Zohair,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">>So If I don't have real fencing device, I can't get a cluster?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It depends, I have some clusters without fencing, they are mainly for virtualization. The cluster is configured not to relocate the services in
case of a failure. I do this manually. (all services are redundant) The Virtual Machine configuration files are stored on a GFS2 file system. I configured this file system to be always available (also when quorum is lost). Because I do all the recovering
manually this does not matter, also no data is written to the GFS2 file system.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">So, you can have a cluster without fencing if a quorum loss does not corrupt your data. You should also set the cluster timeout’s in such a way
that even with a WAN connection the cluster does not loose quorum during normal operation. (I have not tried this)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">For SAMBA you might need “clustered SAMBA”
<a href="http://ctdb.samba.org/samba.html">http://ctdb.samba.org/samba.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Did you have a look at glusterfs?
<a href="http://www.gluster.org/">http://www.gluster.org/</a> It supports synchronization (I do not know if it also works over a WAN connection) But it has nothing to do with drbd. The drbd 8.3 branch is very mature I do not know if this is the same for glusterfs.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Maurits<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Van:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> drbd-user-bounces@lists.linbit.com [mailto:drbd-user-bounces@lists.linbit.com]
<b>Namens </b>Zohair Raza<br>
<b>Verzonden:</b> woensdag 31 oktober 2012 9:51<br>
<b>Aan:</b> Felix Frank<br>
<b>CC:</b> drbd-user@lists.linbit.com<br>
<b>Onderwerp:</b> Re: [DRBD-user] GFS2 freezes<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">So If I don't have real fencing device, I can't get a cluster?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">My requirement is to synchronized two Samba boxes between remote locations, I can't use rsync because of bandwidth consumption and system processing each time it will run it will go through each file and see if it is synced or not. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">While GFS seemed to be the right option, but as two servers are distant from each other I can not have fencing device as it may experience power outage or network failures quite often. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">What do you guys suggest in such scenario?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Regards,<br>
Zohair Raza<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Oct 31, 2012 at 12:30 PM, Felix Frank <<a href="mailto:ff@mpexnet.de" target="_blank">ff@mpexnet.de</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">On 10/31/2012 12:02 AM, Lars Ellenberg wrote:<br>
>>> Manual fencing is not in any way supported. You must be able to call<br>
>>> > > 'fence_node <peer>' and have the remote node reset. If this doesn't<br>
>>> > > happen, your fencing is not sufficient.<br>
>> > fence_node <peer> doesn't work for me<br>
>> ><br>
>> > fence_node node2 says<br>
>> ><br>
>> > fence node2 failed<br>
> Which is why you need a *real* fencing device<br>
> for automatic fencing.<o:p></o:p></p>
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<p class="MsoNormal">...which is bound to sound more than a little cryptic to the<br>
uninitiated, I assume.<br>
<br>
An example for a "classical" fencing method is a power distribution unit<br>
with network access. The surviving node accesses the PDU and cuts the<br>
power to its peer.<br>
This is just one example. Similar results can be achieved using<br>
IPMI/ILOM technologies etc.<br>
<br>
HTH,<br>
Felix<o:p></o:p></p>
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