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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">We found the default (512MB) too small for our RHEL based KVM hypervisors with our local monitoring and puppet running. Some space
for file logs etc. is also good.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">The annoying thing on setting this value higher was that we then found packing problems. Since we allocate on memory, a 48GB machine
with 1GB reserved only has enough memory for 23 2GB instances. However, you can’t buy 50GB machines so we just had to make do
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D;mso-fareast-language:EN-US">J</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Tim
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Juan José Pavlik Salles [mailto:jjpavlik@gmail.com]
<br>
<b>Sent:</b> 04 September 2014 18:46<br>
<b>To:</b> Tomasz Napierala<br>
<b>Cc:</b> openstack-operators@lists.openstack.org<br>
<b>Subject:</b> Re: [Openstack-operators] Hypervisor free memory recommendations<o:p></o:p></span></p>
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<p class="MsoNormal">Hi Tomasz, thanks for your answer. I'll start with 10% and see what happens. Thanks again!<o:p></o:p></p>
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<p class="MsoNormal">2014-09-04 13:37 GMT-03:00 Tomasz Napierala <<a href="mailto:tnapierala@mirantis.com" target="_blank">tnapierala@mirantis.com</a>>:<o:p></o:p></p>
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On 04 Sep 2014, at 18:04, Juan José Pavlik Salles <<a href="mailto:jjpavlik@gmail.com">jjpavlik@gmail.com</a>> wrote:<br>
<br>
> Hi guys, I'm running a Grizzly cloud with Ubuntu 12.04+KVM. I'd like to know if there's any kind of recommended free RAM for the Hypervisor. I know there's a nova variable called "<br>
> reserved_host_memory_mb" but don't know what a proper value would be.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Check on deployed compute node that has no running VMs, add some margin, say 10% and you should be fine. Usually compute nodes are not consuming extra memory besides VMs.<br>
<br>
Regards,<br>
<span class="hoenzb"><span style="color:#888888">--</span></span><span style="color:#888888"><br>
<span class="hoenzb">Tomasz 'Zen' Napierala</span><br>
<span class="hoenzb">Sr. OpenStack Engineer</span><br>
<span class="hoenzb"><a href="mailto:tnapierala@mirantis.com">tnapierala@mirantis.com</a></span><br>
<br>
<br>
<br>
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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">Pavlik Salles Juan José<o:p></o:p></p>
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<p class="MsoNormal">Blog - <a href="http://viviendolared.blogspot.com" target="_blank">
http://viviendolared.blogspot.com</a><o:p></o:p></p>
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