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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US">Andrei,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US">You could try pNFS. It allows to access a data on a local storage directly bypassing NFS and even FS level.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US">Unfortunately, it requires SCSI Persistent Reservation feature so would not work all RAID controllers.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:Calibri;color:black">From: </span>
</b><span style="font-family:Calibri;color:black"><users-bounces@ovirt.org> on behalf of Yaniv Kaul <ykaul@redhat.com><br>
<b>Date: </b>Monday, 26 February 2018 at 14:49<br>
<b>To: </b>Andrei Verovski <andreil1@starlett.lv><br>
<b>Cc: </b>Ovirt Users <users@ovirt.org><br>
<b>Subject: </b>Re: [ovirt-users] Q: VM disk speed penalty NFS vs Local data center storage<o:p></o:p></span></p>
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<p class="MsoNormal">On Mon, Feb 26, 2018 at 1:30 PM, Andrei Verovski <<a href="mailto:andreil1@starlett.lv" target="_blank">andreil1@starlett.lv</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Since oVirt doesn’t support more then 1 host in data center with local storage domain as described here:<o:p></o:p></p>
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<p class="MsoNormal"><a href="http://lists.ovirt.org/pipermail/users/2018-January/086118.html" target="_blank">http://lists.ovirt.org/pipermail/users/2018-January/086118.html</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I have to setup NFS server on node with VMs (on same node) access via NFS.<o:p></o:p></p>
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<p class="MsoNormal">10 GB shared storage is in the future plans yet right now have only 2 nodes with local RAID on each.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Q: What is VM disk speed penalty (approx %) NFS vs Local RAID in oVirt data center storage? <o:p></o:p></p>
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<p class="MsoNormal">Currently I have 2 VMs running our accounting/inventory control system which are critical to storage performance limits.<o:p></o:p></p>
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<p class="MsoNormal">2 other VMs have very low disk activity.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I don't know, but please remember there's both latency and throughput, both of which are somewhat affected. Throughput will benefit from jumbo frames, for example. Unfortunately it may affect latency a bit.<o:p></o:p></p>
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<p class="MsoNormal">There was an interesting patch that if the NFS was local, bypassed the NFS[1]. It was never completed and merged.<o:p></o:p></p>
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<p class="MsoNormal">Lastly, chapter 6 at hyper-converged guide (should be available in few hours) might be an interesting idea for you to consider - a single Gluster that can later expand.<o:p></o:p></p>
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<p class="MsoNormal">Y.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">[1] <a href="https://gerrit.ovirt.org/#/c/68822/">https://gerrit.ovirt.org/#/c/68822/</a><o:p></o:p></p>
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<p class="MsoNormal">[2] <a href="https://ovirt.org/documentation/gluster-hyperconverged/Gluster_Hyperconverged_Guide/">https://ovirt.org/documentation/gluster-hyperconverged/Gluster_Hyperconverged_Guide/</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Thanks in advance<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#888888">Andrei Verovski<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#888888"><o:p> </o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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