<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>We've also always done the same. We deploy any cloud with a minimum of 3 (quorum, etc) but when the database or message queue needs to scale up, the other components probably need to as well so making an equal replica of everything across the environment. <br><br>Sent from my iPhone</div><div><br>On Aug 26, 2017, at 9:13 AM, David Medberry <<a href="mailto:openstack@medberry.net">openstack@medberry.net</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="auto">I'm not aware of any studies as per se, but we have long run rabbitmq, MySQL, and all the API endpoints on the same three nodes. <div dir="auto"><br></div><div dir="auto"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Aug 25, 2017 6:12 PM, "Imtiaz Chowdhury" <<a href="mailto:imtiaz.chowdhury@workday.com">imtiaz.chowdhury@workday.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt">Hi Openstack operators,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Most Openstack HA deployment use 3 node database cluster, 3 node rabbitMQ cluster and 3 Controllers. I am wondering whether there are any studies done that show the pros and cons of co-locating database and
messaging service with the Openstack control services. In other words, I am very interested in learning about advantages and disadvantages, in terms of ease of deployment, upgrade and overall API performance, of having 3 all-in-one Openstack controller over
a more distributed deployment model.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">References to any work done in this area will be highly appreciated.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks, <br>
Imtiaz<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
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