Re: [External] Re: standby replication server throws invalid memory alloc request size , does not start up

On 2018-06-28 10:43:16 -0400, Rui DeSousa wrote:
>
>
> > On Jun 28, 2018, at 9:47 AM, Vijaykumar Jain <vjain(at)opentable(dot)com> wrote:
> >
> > Thanks Scott.
> >
> > fsync is on.
> >
> > postgres=# show fsync;
> > fsync
> > -------
> > on
> > (1 row)
> >
>
> Yeah, I agree with Scott; it sounds like fsync() is being shorted
> somewhere in the I/O path. Are you using a RAID controller; if so is
> the cache setting — write through or write back? If it’s write back
> then writes are being cached and a power outage will lead to data
> corruption — the only saving grace at that point would be the battery
> backup logic on the controller which may or nay not be trustworthy.

How are you making the inference that that's the problem? It could very
well be a postgres bug or somebody having used pg_resetxlog or.. ?

Greetings,

Andres Freund