Re: Postgres Clustering Options

David Kerr wrote:
> Postgres installed on a Cluster configured in active/passive (both pointing to the same SAN
> (If PG or the OS fails we trigger a failover to the passive node)
> Log shipping between that cluster and a single PG Instance off site.
> Is this a common/reccomended method of handling clusterin with Postgres? google searches
> basically point to using a replication based solution, which i don't think would meet my
> performance demands.
>
The part I'm having trouble with here is how it is you expect to keep a
remote node up to date with log-shipping, but then reject log-shipping
based replication as not high enough performance for you?  The classic
problem with log-shipping in PostgreSQL is that you've got a single
recovery process trying to replay the work of what many workers did on
the master, and that can turn into a potential lag problem as volume
spikes upwards.  If you don't expect a standby is going to be able to
keep up with your volume due to that issue, the remote one is going to
be even worse though.

--
Greg Smith    greg@2ndQuadrant.com    Baltimore, MD