<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Nova has stayed out of doing this auto-migrations so far. You are requesting a very specific type of overallocation of resources, as in don't count machines that are shutoff when scheduling, but then automatically move them if they are turned back on. It is an interesting idea, but not something we have discussed implementing.<div><br></div><div>You can generally over-allocate quite a bit, assuming you have swap enabled, and if some of your machines are not fully allocating their ram internally (which is usually the case) you should be fine. In deployments I have done when performance is really important, we simply do not over-allocate at all.</div><div><br></div><div>Keep in mind that the main use case of OpenStack is to run a cloud system, not a virtualization system. In a cloud, you very rarely stop machines and start them later, you generally delete the machine completely when you are done and launch a new one when you need it. For this reason the particular use-case you are looking for hasn't really been considered.</div><div><br></div><div>Vish</div><div><br></div><div><div><div>On Apr 12, 2012, at 9:50 PM, Văn Đình Phúc wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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<div><font color="#000000" size="3" face="Times New Roman"><span id="result_box" lang="en"><span class="hps alt-edited">Ignoring</span> <span class="hps">issues
of</span> <span class="hps">Ram</span><span>.</span> <span class="hps">I</span>
<span class="hps">have</span> <span class="hps">a</span> <span class="hps">number
of</span> <span class="hps">questions</span> <span class="hps">as</span> <span class="hps">the following</span> <span class="hps">model:</span></span></font></div>
<div><font color="#000000" size="3" face="Times New Roman"><span lang="en"><span class="hps"></span></span></font> </div>
<div><font color="#000000" size="3" face="Times New Roman">My node-1's
resource as the following:</font></div>
<ul>
<li><font color="#000000" size="3" face="Times New Roman">CPU : 4 core</font></li>
<li><font color="#000000" size="3" face="Times New Roman">RAM: 4
GB.</font></li></ul><p><font color="#000000" size="3" face="Times New Roman">Now , My
Node-1 is hosting 4 instances:</font></p>
<ul>
<li>3 instance: (each VM: 1 core CPU, 2 GB ram,..). <br>2
instance(i-00000001, i-00000002) is turn of and 1 instance(i-00000003) is
running.</li>
<li>1 instance : (1 core CPU, 1 GB ram). <br>It is
running.(i-00000004)</li></ul><p><font color="#000000" size="3" face="Times New Roman">I request new ínstance by
the euca-run-instance command. My new instance ( i-00000005) is located on the
node 1. This is the problem for the nova-scheduler.</font></p><p><font color="#000000" size="3" face="Times New Roman">What is happen ? If I
reboot 2 instances : i-00000001,i-00000002.</font></p><p>How do we manage this problem in Openstack ? </p><p><font color="#000000" size="3" face="Times New Roman">I think that: My 2
instances (i-00000001 , i-00000002) should be migrated to the rest available
resources as node-2 and node-3.</font></p><p><font color="#000000" size="3" face="Times New Roman">If not, it's actually very
difficult to manage and reboot the instances which are turned off.
And their resources-allocated will be reused for the new instances.</font></p><font color="#000000" size="3" face="Times New Roman">
</font><div><font color="#000000" size="3" face="Times New Roman"></font><font color="#993300" size="3" face="Times New Roman">----- <i><b>Thông
điệp gốc :</b></i> -----</font><font color="#000000" size="3" face="Times New Roman">
<div style="BACKGROUND: #f0b070"><b>Gửi từ : </b><a href="mailto:vishvananda@gmail.com">Vishvananda Ishaya</a> <font color="#0000ff">[<a href="mailto:vishvananda@gmail.com">vishvananda@gmail.com</a>]</font> </div>
<div><b>Gửi lúc : </b>12/04/2012 11:43 PM</div></font></div>
<div style="font-color: " black;="" background:="" #e4e4e4=""><b>Gửi tới :
</b><a href="mailto:openstack@lists.launchpad.net;vishvananda@gmail.com">openstack@lists.launchpad.net;vishvananda@gmail.com</a></div>
<div><b>Chủ đề : </b>Re: [Openstack] The Scheduling feature when reboot the
instance</div>
<div> </div>No this does not exist. If you are going to overprovision
ram, you should probably make sure that you have swap enabled on your host.
<div><br></div>
<div>Vish</div>
<div><br></div>
<div>
<div>
<div>On Apr 12, 2012, at 4:10 AM, Văn Đình Phúc wrote:</div><br class="Apple-interchange-newline">
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<div>Hi.</div>
<div>I'm using Openstack (2011.3
(2011.3-nova-milestone-tarball:tarmac-20110922115702-k9nkvxqzhj130av2) with 3
Compute nodes.</div>
<div>My scheduling option is default.</div>
<div>I have the problem as the following steps:</div>
<ul>
<li>Compute node 1 is installed the modules: nova-api,
nova-compute and nova-network.
</li><li>The resource of node-1 max is fitfor 3 instances
(m1.small): i-00000001, i-00000002, i-00000003.
</li><li>I turn off i-00000001.
</li><li>and then I request new ínstance by the euca-run-instance command , My
new instance ( i-00000004) is located on the node 1.
</li><li>The resources: RAM , CPU,.. of node-2 and node-3 is available.
</li><li>finally, I reboot the i-00000001.What is happen? the i-00000001 is
rebooted on the node-1 , and It's shutdown off after reboot.I checked the
libvirt's log :<br><br>"Failed to allocate 2147483648 B: Cannot
allocate memory<br>2012-04-12 16:11:50.530: shutting down"<br></li></ul><p>So , Do Openstack have the sheduling feature when rebooting the
instance ? </p><p>Example: As above , My instance (i-00000001) will
be migrated to node-2 or node-3 when the
resource of node-1 is not available.</p>
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