[pgpool-general: 2431] Re: watchdog quorum

[Tatsuo Ishii]

> On Thu, 16 Jan 2014 00:35:40 +0400
> Sergey Arlashin <sergeyarl.maillist at gmail.com> wrote:
> 
>> Hi!
>> Does watchdog have any sort of quorum mechanism (like corosync/pacemaker has) in order to avoid "split brains"? 
> 
> Watchdog doesn't have quorum with voting like pacemaker. Another mechanism to 
> avoid split-brain is trusted_servers. When a pgpool has some network problem
> and cannot ping to any host in trusted_servers, the pgpool goes to down and
> cannot become active.

Additional notes. In Pacemaker it is recommended to not use the quorum
mechanism if the number of nodes is 2. So if you plan to have only 2
pgpool nodes, it does not matter if pgpool employs the quorum
mechanism or not.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp