<div dir="ltr"><br><br><div class="gmail_quote"><div dir="ltr">On Thu, Mar 2, 2017 at 4:44 PM Yedidyah Bar David <<a href="mailto:didi@redhat.com">didi@redhat.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Tue, Feb 28, 2017 at 10:06 PM, Chris Adams <<a href="mailto:cma@cmadams.net" class="gmail_msg" target="_blank">cma@cmadams.net</a>> wrote:<br class="gmail_msg">
> Hello again, still working on my upgrade from 3.5...<br class="gmail_msg">
><br class="gmail_msg">
> I'm trying to understand the cluster compatibility version setting and<br class="gmail_msg">
> how that applies to major upgrades. Do I have to always raise the<br class="gmail_msg">
> compatibility version when I do a major upgrade?<br class="gmail_msg">
<br class="gmail_msg">
Not immediately.<br class="gmail_msg"></blockquote><div><br></div><div>Right, but then people forget to do it later ;-)</div><div>Y.<br></div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br class="gmail_msg">
Doing this will let you use the new features.<br class="gmail_msg">
<br class="gmail_msg">
> In other words, when I<br class="gmail_msg">
> upgrade from 3.5 to 3.6, do I need to raise it to 3.6 before I upgrade<br class="gmail_msg">
> to 4.0 (and then again raise it 4.0 before upgrading to 4.1)?<br class="gmail_msg">
<br class="gmail_msg">
Each engine version has a set of supported compatibility levels.<br class="gmail_msg">
If you run engine-setup and have a cluster/DC with a too-old level,<br class="gmail_msg">
it will refuse to upgrade.<br class="gmail_msg">
<br class="gmail_msg">
><br class="gmail_msg">
> It looks like the 3.6->4.0 EL6->EL7 migration requires the cluster<br class="gmail_msg">
> compatibility level to be at 3.6 (if I'm reading things right).<br class="gmail_msg">
<br class="gmail_msg">
Indeed.<br class="gmail_msg">
<br class="gmail_msg">
><br class="gmail_msg">
> It appears that when I upgrade to 3.6, I will have to stop all running<br class="gmail_msg">
> VMs to raise the compatibility version (and I found an open bug about<br class="gmail_msg">
> whether that's possible with the hosted engine). It sounds like with<br class="gmail_msg">
> 4.0, the VMs can be flagged for compatibility and I can reboot them<br class="gmail_msg">
> individually. I have over 80 VMs, many behind a load balancer (for HA<br class="gmail_msg">
> and load sharing), but taking them all down will obviously still<br class="gmail_msg">
> interrupt service for a while.<br class="gmail_msg">
><br class="gmail_msg">
> Is there a safe way around that?<br class="gmail_msg">
><br class="gmail_msg">
> I saw someone mention they partitioned their servers and made a new<br class="gmail_msg">
> cluster (with the new version), and migrated VMs from cluster to<br class="gmail_msg">
> cluster. Can I do live migrations in that case? How do I get the<br class="gmail_msg">
> hosted engine from one cluster to another (especially with starting at<br class="gmail_msg">
> 3.5)?<br class="gmail_msg">
<br class="gmail_msg">
You'll definitely need hosted-engine downtime, but that's usually not<br class="gmail_msg">
an issue. For your other VMs, not sure - I think that if you get a mark<br class="gmail_msg">
saying they should be rebooted, they should. See also:<br class="gmail_msg">
<br class="gmail_msg">
<a href="https://bugzilla.redhat.com/show_bug.cgi?id=1336527" rel="noreferrer" class="gmail_msg" target="_blank">https://bugzilla.redhat.com/show_bug.cgi?id=1336527</a><br class="gmail_msg">
<br class="gmail_msg">
Best,<br class="gmail_msg">
--<br class="gmail_msg">
Didi<br class="gmail_msg">
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</blockquote></div></div>