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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Jake,<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 style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I haven’t had a chanced to test with my KVM cluster yet but it should be a default things from 3.3.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Just be in mind that running Virtual Machines is NOT a supported things for Redhat Storage server according to Redhat Sales people. They said towards the end
of the year. As you might have observed performance specially for write isn’t any near fantastic.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><br>
Fernando<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"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> gluster-users-bounces@gluster.org [mailto:gluster-users-bounces@gluster.org]
<b>On Behalf Of </b>Christian Wittwer<br>
<b>Sent:</b> 09 July 2012 15:51<br>
<b>To:</b> Jake Grimmett<br>
<b>Cc:</b> gluster-users@gluster.org<br>
<b>Subject:</b> Re: [Gluster-users] "Granular locking" - does this need to be enabled in 3.3.0 ?<o:p></o:p></span></p>
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<p class="MsoNormal">Hi Jake<o:p></o:p></p>
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<p class="MsoNormal">I can confirm exact the same behaviour with gluster 3.3.0 on Ubuntu 12.04. During the self-heal process the VM gets 100% I/O wait and is locked.<o:p></o:p></p>
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<p class="MsoNormal">After the self-heal the root filesystem was read-only which forced me to do a reboot and fsck.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Christian<o:p></o:p></p>
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<p class="MsoNormal">2012/7/9 Jake Grimmett <<a href="mailto:jog@mrc-lmb.cam.ac.uk" target="_blank">jog@mrc-lmb.cam.ac.uk</a>><o:p></o:p></p>
<p class="MsoNormal">Dear All,<br>
<br>
I have a pair of Scientific Linux 6.2 servers, acting as KVM virtualisation hosts for ~30 VM's. The VM images are stored in a replicated gluster volume shared between the two servers. Live migration works fine, and the sanlock prevents me from (stupidly) starting
the same VM on both machines. Each server has 10GB ethernet and a 10 disk RAID5 array.<br>
<br>
If I migrate all the VM's to server #1 and shutdown server #2, all works perfectly with no interruption. When I restart server #2, the VM's freeze while the self-heal process is running - and this healing can take a long time.<br>
<br>
I'm not sure if "Granular Locking" is on. It's listed as a "technology preview" in the Redhat Storage server 2 notes - do I need to do anything to enable it?<br>
<br>
i.e. set "cluster.data-self-heal-algorithm" to diff ?<br>
or edit "cluster.self-heal-window-size" ?<br>
<br>
any tips from other people doing similar much appreciated!<br>
<br>
Many thanks,<br>
<br>
Jake<br>
<br>
jog <---at---> <a href="http://mrc-lmb.cam.ac.uk" target="_blank">mrc-lmb.cam.ac.uk</a><br>
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<p class="MsoNormal"><o:p> </o:p></p>
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