<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">Hi,</div><div class="gmail_extra"><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
I'm wondering at the moment what the actual difference is between<br>
Shared and Local Storage Datacenters.<br>
<br></blockquote><div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default"><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">By definition, taken from here [1], <br>Local storage:</div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">When you set up a host to use local storage, the host automatically gets
added to a new data center and cluster that <b>no other hosts</b> can be added
to.</div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">Multiple host clusters require that all hosts have access to all storage domains, which is <b>not </b>possible with local storage.<br></div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default"> Virtual machines created in a single host cluster cannot be migrated, fenced or scheduled.</div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default"><br></div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">Shared storage:</div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">Set up NFS shares that will serve as a data domain and an export domain.</div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">Storage data domains can be unattached from a data center and imported
to another data center in the same environment, or in a different
environment. Virtual machines, floating virtual disk images, and
templates can then be uploaded from the imported storage domain to the
attached data center.</div></div></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
As far as I can see a Local DC supports NFS as well which makes it a<br>
more flexible DC in storage if you ask me, so why do both still exist<br>
?<br>
<br></blockquote><div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">In fact by setting a local DC, only one host can be added and there's no high availability functionality. <br></div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">According to [2], a local DC supports NFS shares for migration needs.</div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">In case of sharing resources between more that one host, you should use a Shared DC.<br></div></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Is it possible in a decent way to change a running Shared Storage DC<br>
to a Local one and Keep the NFS shares and add some local mounts for<br>
specific hosts ?<br>
<br></blockquote><div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">Since a shared DC can support more than one host (while local DC supports exactly one), it's not possible moving from 'Share' type to a 'Local' type.</div></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
I hope someone can clearify!<br></blockquote><div><div style="font-family:tahoma,sans-serif;font-size:small;display:inline" class="gmail_default">Hope it makes more sense.</div> </div></div></div><div class="gmail_extra"><br></div><div class="gmail_extra"><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default"></div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">[1] <a href="https://www.ovirt.org/documentation/admin-guide/chap-Storage/" target="_blank">https://www.ovirt.org/<wbr>documentation/admin-guide/<wbr>chap-Storage/</a></div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default">[2] <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1302185" target="_blank">https://bugzilla.redhat.com/<wbr>show_bug.cgi?id=1302185</a><br></div><div style="font-family:tahoma,sans-serif;font-size:small" class="gmail_default"><br clear="all"><div><span style="font-family:tahoma,sans-serif"><b>Regards,<br></b></span></div><span style="font-family:tahoma,sans-serif"><b>Shani Leviim</b></span></div><br></div></div>