Hi Tom,For minimal downtime, you could build your new cluster and then add a node as a slave to your existing host, sounds like that's your plan. This will then allow data to flow over to the cluster. Once your happy it's replicating ok then do an orderly switchover and forget the original master. Downtime is maybe 10 minutes on a slow day depending on what effort to repoint your application layer. Also, you can probably bring up a single app node initially much quicker and add your remaining nodes more leisurely. Allows you to check for errors on your app layer through a single node and control thingsI would use Percona Xtrabackup to make our backup. It's much quicker and I found much better to MySQLDump unless it's presently only a small database. Will also carry over your GTID etc for sync. I have some notes on my blog on my switchoversCheersPeterOn Wed, 6 Nov 2019 at 00:55, Tom Worster <fsb@thefsb.org> wrote:I've three servers with Debian 9, Maria 10.1 and running a Galera cluster._______________________________________________We're upgrading the hardware by getting three new servers. They will have Debian 10 and Maria 10.3.What are my options for accomplishing this with minimal service downtime?One option I can think of
- Using a mysqldump snapshot, set up Maria on one of the new servers to replicate as an asyncronous slave from one node of the existing cluster.
- Set up Maria on the two remaining new servers in a cluster with that async slave.
- When all looks good, migrate workload to the new cluster.
Does that seem reasonable?Tom
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