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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Neelesh:<br><br><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Just a quick FYI – We are also running a Nexenta SAN with our OpenNebula deployment.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>At the moment, we are utilizing NFS mounts from the Nexenta SAN for our datastores, over a 10Gb switched storage network.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>This has worked well until we got into the ~250 VM mark. Running VM’s are still maintaining great storage performance, and hitting upwards of 8k iops when needed.<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'>However, the initial deployments of VMs now, are quite bogged down, and can take upwards of an hour or more to deploy a single VM with a 100Gb drive. We believe this is now due to some NFS bogging. We are currently in the process of moving to iSCSI with our OpenNebula + Nexenta deployments, and are expecting a boost in performance as it relates to the initial deployment of VMs.<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 style='font-size:14.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Robert Foote<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Chief Technical Officer<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Phone | 1-800-611-8763 Ext. 201<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>www.bpsnode.com<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 style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Users [mailto:users-bounces@lists.opennebula.org] <b>On Behalf Of </b>Jaime Melis<br><b>Sent:</b> Tuesday, January 13, 2015 11:32 AM<br><b>To:</b> ngurjar@neeleshgurjar.co.in<br><b>Cc:</b> users<br><b>Subject:</b> Re: [one-users] Queries regarding Storage Backend for DataStore<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'>Hi,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p><div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal>- Very first is how actually these datastore works in comparison with Cinder and Glance of OpenStack ?<o:p></o:p></p></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>The best thing to do here is to read the documentation and let us know if there's something you don't understand.<br><a href="http://docs.opennebula.org/4.10/administration/storage/sm.html">http://docs.opennebula.org/4.10/administration/storage/sm.html</a><br> <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal>- Which Datastore I can put on faster connectivity and which on slower?<o:p></o:p></p></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I don't understand the question, the only thing I can say is that the storage subsystem is something OpenNebula relies on. You will get the same performance on your VMs with or without OpenNebula, as it depends on the hypervisor hardware and storage. So when thinking about this, think about it in terms of general performance.<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:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal>- Suppose I launched 2 VMs from one image, where the images are stored of Both VMs?<br>In OpenStack I need to create Volume and attached as a RootDisk to instance, how should I go ahead in OpenNebula?<o:p></o:p></p></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>You register an image, which will be stored in the datastore of choice, and then you create a template that references that image. When you instantiate it, OpenNebula will clone that image, and depending on the datastore driver it will clone it somewhere. Read the guide for each datastore type for more info.<br> <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal>- How to calculate required IOPS to decide Storage Backend eg. Number of Drives, RAID level, Connectivity, etc.<o:p></o:p></p></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Best thing to do here is to run some benchmarks, as it largely depends on the whole setup<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:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal>- I was planning to use iSCSI with Nexenta based storage. Is that ok or should I go with Ceph ? will Ceph or NFS give performance ?<o:p></o:p></p></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Yes, Ceph will have better performane than NFS.<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal>- Any suggestions to design the storage backend for DataStore.<o:p></o:p></p></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>It depends on each driver<br> <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal>- Do I need fiber connectivity between Compute Nodes and Storage ?<o:p></o:p></p></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>No, but the better the connectivity is, the less chances you have of having a bottleneck. <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal><br>Regards<br>Neelesh Gurjar<br>_______________________________________________<br>Users mailing list<br><a href="mailto:Users@lists.opennebula.org" target="_blank">Users@lists.opennebula.org</a><br><a href="http://lists.opennebula.org/listinfo.cgi/users-opennebula.org" target="_blank">http://lists.opennebula.org/listinfo.cgi/users-opennebula.org</a><o:p></o:p></p></blockquote></div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><br clear=all><br>-- <o:p></o:p></p><div><div><div><p class=MsoNormal>Jaime Melis<br>Project Engineer<br>OpenNebula - Flexible Enterprise Cloud Made Simple<br><a href="http://www.OpenNebula.org" target="_blank">www.OpenNebula.org</a> | <a href="mailto:jmelis@opennebula.org" target="_blank">jmelis@opennebula.org</a><o:p></o:p></p></div></div></div></div></div></body></html>