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</o:shapelayout></xml><![endif]--></head><body lang=FR-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi guys,<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-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Just a quick note, I had this setup at some point (NFS-mounted /var/lib/nova/instances) which is essential to get live VM migrations if I’m not mistaken (live migration was working perfectly). The problem I had with this setup was that the VM startup time was considerably slower than when the images were residing on a local disk (and I mean, even after all images are “cached”).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Basically an image will start the fastest when it is cached locally (local drive)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Then, not quite as fast when cached but on a NFS-mounted directory<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Then really slowly when residing entirely on another disk and needed to be written locally to be cached<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>These are the observations I made but I realize other factors weigh in (SAS vs SATA disk, network speed, etc.) Please advise if you get the same speed in NFS-cached vs local-cached setup as it might convince me to go back to an NFS share (also were you using SAS disks to serve the NFS?).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=FR style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De :</span></b><span lang=FR style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> openstack-operators-bounces@lists.openstack.org [mailto:openstack-operators-bounces@lists.openstack.org] <b>De la part de</b> Diego Parrilla<br><b>Envoyé :</b> 20 octobre 2011 04:54<br><b>À :</b> Till Mossakowski<br><b>Cc :</b> openstack-operators@lists.openstack.org<br><b>Objet :</b> Re: [Openstack-operators] Starting large VMs takes quite long<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi, <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>my answers below.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Wed, Oct 19, 2011 at 8:12 PM, Till Mossakowski <<a href="mailto:Till.Mossakowski@dfki.de">Till.Mossakowski@dfki.de</a>> wrote:<o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Hi,<o:p></o:p></p><p class=MsoNormal>my answers below,<o:p></o:p></p><p class=MsoNormal><br>many thanks for your quick answer.<o:p></o:p></p><div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><p class=MsoNormal> I have set up openstack using stackops.<br><br><br>Good choice ;-)<o:p></o:p></p></blockquote><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>Yes, the stackops GUI is very nice. However, stackops is based on cactus, right? Is there a way of using diablo with stackops? Perhaps it is possible to upgrade the Ubuntu lucid distro that is coming with stackops to natty or oneiric and then upgrade to diablo using the source ppa:openstack-release/2011.3 for openstack?<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Yes, the 0.3 version with Diablo release is coming. We detected some QA issues. But things are working much better now.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><p class=MsoNormal>5GB image it's not too big... we use NFS to share instances among nodes<br>to help with the live migration and performance it's acceptable. How<br>much is 'quite a while' in seconds?<o:p></o:p></p></blockquote><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>between half a minute and a minute (I haven't taken the exact time...).<br>This is too long for our users.<o:p></o:p></p></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>If the virtual disks are cached, launching a 40GB virtual machine takes less than 5 seconds in our test platform (IBM x3550M3 Dual Xeon 5620 64GB with NFS as shared storage on 1Gb)<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><p class=MsoNormal>If you share the /var/lib/nova/instances with NFS, during the 'launch'<br>process the base virtual image is copied to '_base'. Depending on the<br>size of this file it will take longer. Once it's copied next time you<br>use this image it should go much faster.<br><br>Note: I have tested right now with a 1Gb launching a >25GB Windows VM<br>and it took 3-4 minutes the first time. New Windows images, it took only<br>a few seconds.<o:p></o:p></p></blockquote><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>This is interesting. Is there a way of telling the scheduler to prefer a compute node that already has copied the needed image?<o:p></o:p></p></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Try this:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>1) Configure the compute nodes to use a shared directory with NFS on /var/lib/nova/instances<o:p></o:p></p></div><div><p class=MsoNormal>2) Launch ALL the virtual disks you need at runtime. It will take a while the first time.<o:p></o:p></p></div><div><p class=MsoNormal>3) Virtual disks are now cached in /var/lib/nova/instances/_base<o:p></o:p></p></div><div><p class=MsoNormal>4) Try to launch now the virtual disks again. They should start very fast.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>If you need some kind of assistance, please let me know.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Regards<o:p></o:p></p></div><div><p class=MsoNormal>Diego<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal><br><br>Best, Till<br><br>-- <br>Prof. Dr. Till Mossakowski Cartesium, room 2.51 Phone <a href="tel:%2B49-421-218-64226" target="_blank">+49-421-218-64226</a><br>DFKI GmbH Bremen Fax <a href="tel:%2B49-421-218-9864226" target="_blank">+49-421-218-9864226</a><br>Safe & Secure Cognitive Systems <a href="mailto:Till.Mossakowski@dfki.de" target="_blank">Till.Mossakowski@dfki.de</a><br>Enrique-Schmidt-Str. 5, D-28359 Bremen <a href="http://www.dfki.de/sks/till" target="_blank">http://www.dfki.de/sks/till</a><br><br>Deutsches Forschungszentrum fuer Kuenstliche Intelligenz GmbH<br>principal office, *not* the address for mail etc.!!!:<br>Trippstadter Str. 122, D-67663 Kaiserslautern<br>management board: Prof. Wolfgang Wahlster (chair), Dr. Walter Olthoff<br>supervisory board: Prof. Hans A. Aukes (chair)<br>Amtsgericht Kaiserslautern, HRB 2313<o:p></o:p></p></div></div></blockquote></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><br clear=all>-- <span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p><div><p class=MsoNormal><span lang=ES style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Diego Parrilla<br></span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>CEO</span></b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'><br></span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><a href="http://www.stackops.com/" target="_blank">www.stackops.com</a> | </span></b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'> <a href="mailto:diego.parrilla@stackops.com" target="_blank">diego.parrilla@stackops.com</a> | +34 649 94 43 29 | skype:diegoparrilla</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><a href="http://www.stackops.com/" target="_blank"><b><br></b></a><o:p></o:p></span></p></div><div><p><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#004438;border:solid windowtext 1.0pt;padding:0cm'><img border=0 width=100 height=100 id="Image_x0020_1" src="cid:~WRD000.jpg" alt="Description : Image supprimée par l'expéditeur."></span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#004438'><o:p></o:p></span></b></p></div><div><p><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>******************** ADVERTENCIA LEGAL ******************** <br>Le informamos, como destinatario de este mensaje, que el correo electrónico y las comunicaciones por medio de Internet no permiten asegurar ni garantizar la confidencialidad de los mensajes transmitidos, así como tampoco su integridad o su correcta recepción, por lo que STACKOPS TECHNOLOGIES S.L. no asume responsabilidad alguna por tales circunstancias. 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