Re: pitr standby on slave with skewed time

On Fri, 2008-07-11 at 12:15 -0400, Tom Lane wrote:
> Robert Treat <xzilla(at)users(dot)sourceforge(dot)net> writes:
> > Was review a clients config/setup and ran across a pitr warm standby scenario
> > where the master machine is set to the current time, but the slave's time is
> > currently sitting back in the month of May. Outside of getting ntp setup on
> > the machine, I am wondering if I need to do anything special with the
> > postgresql setup, or if just setting the correct date on the machine is a
> > safe enough operation that nothing else would need to be done (like re-doing
> > the base backup). Any thoughts?
>
> AFAIR you should be all right ... PITR only looks at WAL indexes, not
> file timestamps.

WAL filenames, just in case anybody listening thinks "I didn't create an
index on my WAL, should I?". This is so people that set their pg_xlog
filesystem no file modification timestamps don't screw up their
recovery.

> The slave does watch the current time to decide when to do recovery
> restartpoints, so if you were setting the clock *back* by a large amount
> it might be wise to stop and restart the slave postmaster. Forward
> should be no problem though.

Yeh, you're good.

--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support