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<p>Thank you very much, Mr Leviim! <br>
</p>
<p>This made things clear.<br>
</p>
<pre class="moz-signature" cols="72">Eduardo Mayoral Jimeno (<a class="moz-txt-link-abbreviated" href="mailto:emayoral@arsys.es">emayoral@arsys.es</a>)
Administrador de sistemas. Departamento de Plataformas. Arsys internet.
+34 941 620 145 ext. 5153</pre>
<div class="moz-cite-prefix">On 28/08/17 11:14, Shani Leviim wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAMO6KYr-Nd4xuXPNMaGsJUv-ZmZ2xg1x-d8CD9gnwJ-VgOpLBA@mail.gmail.com">
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<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" moz-do-not-send="true">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"
moz-do-not-send="true">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"
moz-do-not-send="true">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"
moz-do-not-send="true">+34 941 620 145 ext. 5153</a><br>
<br>
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</font></span></blockquote>
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