Comments - SST smethod: rsync_wan
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What do you mean by "doesn't support GTID clusters"?
I have never heard of a rsync WAN method either. It is not included in MariaDB so if it is an external script; you need to include it yourself.
If you want to speed up an xtrabackup SST use the following options:
[xtrabackup] parallel=N # N=number of threads [sst] compressor=pigz decompressor='pigz -dc' streamfmt=xbstream
You need to install the "pigz" package on your galera servers. It will allow you to use parallel gzip compression/decompression.
Just in case it still matters, to use rsync_wan method one needs to rename/copy/link the usual wsrep_sst_rsync script to wsrep_sst_rsync_wan. Note however, that it will reduce network traffic at the expense of extra IO and therefore may not provide the expected speed gain.
I've done this by making a symlink, I'm just wondering why this isn't done by default? I'd also like to verify if the delta transfer is indeed used, but I'm not sure how I can verify this?