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<span style="font-weight:bold">From: </span><Baldassin>, Santiago B <<a href="mailto:santiago.b.baldassin@intel.com">santiago.b.baldassin@intel.com</a>><br>
<span style="font-weight:bold">Reply-To: </span>"OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Date: </span>Wednesday, March 26, 2014 at 5:17 AM<br>
<span style="font-weight:bold">To: </span>"OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [openstack-dev] [nova][scheduler] Availability Zones and Host aggregates..<br>
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<p class="MsoNormal"><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);">I would say that the requirement is not valid. A host aggregate con only have one availability zone so what you actually can have is a compute node
that’s part of 2 host aggregates, which actually have the same availability zone.</span></p>
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<div>It is in our case where we have a superset host aggregate that has all the hosts and then we have subset host aggregates(AZ) based on PDU. Need is that our user can specify the AZ based on the PDU but also in case no AZ is specified we want to load balance
from the superset which contains two host-aggregates(AZ).</div>
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<p class="MsoNormal"><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);">In the scenario you mentioned below where you create the aggregates without associating the availability zone, after updating the aggregates with
the zones, the hosts still share the same availability zone right?</span></p>
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<div>No the host becomes part of two availability zones one for each of the host aggregates.</div>
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<p class="MsoNormal"><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size: 11pt; font-family: Calibri, sans-serif;">From:</span></b><span style="font-size: 11pt; font-family: Calibri, sans-serif;"> John Garbutt [<a href="mailto:john@johngarbutt.com">mailto:john@johngarbutt.com</a>]
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<b>Sent:</b> Wednesday, March 26, 2014 8:47 AM<br>
<b>To:</b> OpenStack Development Mailing List<br>
<b>Subject:</b> Re: [openstack-dev] [nova][scheduler] Availability Zones and Host aggregates..<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Sounds like an extra weighter to try and balance load between your two AZs might be a nicer way to go.<o:p></o:p></p>
<p>The easiest way might be via cells, one for each AZ . But not sure we merged that support yet. But there are patches for that.<o:p></o:p></p>
<p>John<o:p></o:p></p>
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<p class="MsoNormal">On 25 Mar 2014 20:53, "Sangeeta Singh" <<a href="mailto:singhs@yahoo-inc.com">singhs@yahoo-inc.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;">Hi,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;">The availability Zones filter states that theoretically a compute node can be part of multiple availability zones. I have a requirement where I need to make a compute node
part to 2 AZ. When I try to create a host aggregates with AZ I can not add the node in two host aggregates that have AZ defined. However if I create a host aggregate without associating an AZ then I can add the compute nodes to it. After doing that I can update
the host-aggregate an associate an AZ. This looks like a bug.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;">I can see the compute node to be listed in the 2 AZ with the availability-zone-list command.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;">The problem that I have is that I can still not boot a VM on the compute node when I do not specify the AZ in the command though I have set the default availability zone
and the default schedule zone in nova.conf.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;">I get the error “ERROR: The requested availability zone is not available”<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;">What I am trying to achieve is have two AZ that the user can select during the boot but then have a default AZ which has the HV from both AZ1 AND AZ2 so that when the user
does not specify any AZ in the boot command I scatter my VM on both the AZ in a balanced way.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;">Any pointers.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Calibri, sans-serif;">Sangeeta<o:p></o:p></span></p>
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