<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">Hi Eduardo,</div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">Welcome aboard! <br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">First, you may find some relevant information in here: <a href="http://www.ovirt.org/documentation/admin-guide/administration-guide/" target="_blank">http://www.ovirt.org/<wbr>documentation/admin-guide/<wbr>administration-guide/</a> .</div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">Regarding your questions:</div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">* A data domain in an oVirt Data Center must be available to every Host on the Data Center: Am I right?<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">Yes, you're right.</div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">* Can I manually migrate VMs between Datacenters?</div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">VM migration can't be performed between data canters, so you can't use the 'migrate VM' function.<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">In order to "migrate" your VM between different data canters, you can use 'export' and 'import' functions and an 'export domain':<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">By creating an export domain for one of your DC's (each DC can have up to one export domain), and exporting your VM to that storage domain, <br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">you can then detach the export domain from that DC and attach it to the other DC, and by importing there your VM you'll finish the transaction. <br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">Another option is to detach the VM's storage domain from one DC and attach it the second one.<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">That way you'll move the whole storage domain between your DCs. <br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">If you have any further questions, don't hesitate to ask :)<br></div><div class="gmail_extra"><br clear="all"><div><div class="m_2439165819232262882gmail-m_286038821312995006gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><span style="font-family:tahoma,sans-serif"><b>Regards,<br></b></span></div><span style="font-family:tahoma,sans-serif"><b>Shani Leviim<br></b></span></div></div></div></div></div>
<br><div class="gmail_quote">On Thu, Aug 24, 2017 at 2:51 PM, Eduardo Mayoral <span dir="ltr"><<a href="mailto:emayoral@arsys.es" target="_blank">emayoral@arsys.es</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi,<br>
<br>
First of all, sorry for the naive question, but I have not been able<br>
to find good guidance on the docs.<br>
<br>
I come from the VMWare environment, now I am starting to migrate<br>
some workload from VMWare to oVirt (v4.1.4 , CentOS 7.3 hosts).<br>
<br>
In VMWare I am used to have one datacenter, several host clusters,<br>
and a bunch of iSCSI Datastores, but we do not map every iSCSI<br>
LUN/datastore to every host. Actually we used to do that, but we hit<br>
limits on the number of iSCSI paths with our infrastructure.<br>
<br>
Rather than that, we have groups of LUNs/Datastores mapped to the<br>
ESXi hosts which form a given VMware cluster. Then we have a couple of<br>
datastores mapped to every ESXi in the vmware datacenter, and we use<br>
those to store the ISO images and as storage that we use when we need to<br>
migrate VMs between clusters for some reason.<br>
<br>
Given the role of the Master data domain and the SPM in oVIrt it is<br>
my understanding that I cannot replicate this kind of setup in oVirt: a<br>
data domain in an oVirt Data Center must be available to every Host on<br>
the Data Center: Am I right?<br>
<br>
So, our current setup is still small, but I am concerned that as it<br>
grows, if I stay with one Datacenter, several clusters and a group of<br>
data domains mapped to every host I may run again into problems with the<br>
number of iSCSI paths (the limit in VMWare was around 1024), it is easy<br>
to reach that limit as it is (number of hosts) * (number of LUNs) *<br>
(number of paths/LUN).<br>
<br>
If I split my setup in several datacenters controlled by a single<br>
oVirt-engine in order to keep the number of iSCSI paths reasonable. Can<br>
I manually migrate VMs between Datacenters? I assume that in order to do<br>
that, those datacenters will need to share some data domain , Can this<br>
be done? Maybe with NFS?<br>
<br>
Thanks for your help!<br>
<span class="m_2439165819232262882gmail-m_286038821312995006HOEnZb"><font color="#888888"><br>
--<br>
Eduardo Mayoral Jimeno (<a href="mailto:emayoral@arsys.es" target="_blank">emayoral@arsys.es</a>)<br>
Administrador de sistemas. Departamento de Plataformas. Arsys internet.<br>
<a href="tel:%2B34%20941%20620%20145%20ext.%205153" value="+34941620145" target="_blank">+34 941 620 145 ext. 5153</a><br>
<br>
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