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Excerpts from Sławek Kapłoński's message of 2014-09-18 12:34:53 -0700:
> Hello,
> 
> Thanks all of You guys for help. I will try to apply that percona's scripts 
> and configure it in active/pasive mode.
> About "mysql has gone away" I thought so it is not big problem but it looks 
> "ugly" in logs 
> Simon - I think that it is not related strictly to neutron and similar 
> problems can happend also in nova.
> 
> I have one more question to You guys. I know that there is mysql cluster 
> solution based on galera which is made by percona. Is it really better that 
> "pure" mysql-wsrep and galera installed or maybe it doesn't matter?
> 

One big reason it might be "better" is that Percona is quite good at
supporting it. It also has direct support for more efficient re-syncing
by using xtrabackup instead of the rather cumbersome "SST". But I could
be mistaken, and pure mysql-wsrep might also have that.