On Wed, Mar 29, 2017 at 5:16 PM, Nicolas Ecarnot <nicolas@ecarnot.net> wrote:
Le 29/03/2017 à 15:54, Yedidyah Bar David a écrit :
On Wed, Mar 29, 2017 at 4:35 PM, Nicolas Ecarnot <nicolas@ecarnot.net> wrote:
[Please ignore the previous msg]
Hello,
Hello Didi,
One of our DC is a very small one, though quite critical. It's almost hyper converged : hosts are compute+storage, but the engine is standalone.
And you intend to keep it that way? You didn't mention below.
I intend to keep it this way.
At first glance, I would go this way (feel free to comment) : - upgrade the OS of the engine : 6.7 -> 7.3
How? This isn't supported, in principle, although it might work.
Mmmm, yep, you're right. Many people documented it. I'm not very fond of playing for such a critical part.
The "official" way is using engine-backup to backup and restore it. See also: https://bugzilla.redhat.com/show_bug.cgi?id=1332463
Ok, Sent you a question there.
Replied.
During this upgrade, I have no constraint to keep everything running, total shutdown is acceptable.
So you can also do a full backup and restore.
I could. But I may run out of hosts at present.
Create an NFS export domain somewhere, export all your VMs there, recreate everything from scratch, import the VMs. Will take much longer, but then you don't need to risk/ test/prepare for problems in upgrading gluster.
Well, so your overall opinion is that I should stick to KISS, correct?
I didn't say that. I don't know gluster. I just said that there *is* an option to KISS, if you want to. Some people prefer to take the "smarter" path (upgrade in-place), and it might work for them. If you want that, I simply suggest to spend some more time both reading and testing gluster upgrades. Personally I did both, and preferred backup/restore on more critical systems, at least when I had the option. If you do your math, test, and reach a conclusion that full backup/restore (with an export domain) will simply take more time than your downtime window, this is simply not an option... OTOH if you know that gluster upgrade is bullet-proof, from both testing and reading other people's reports, then go with it. Personally I'd still backup everything beforehand, if I have the option :-) -- Didi