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Re: Problem with pgstat timeouts

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "pgsql-admin" <pgsql-admin(at)postgresql(dot)org>, "Benjamin Krajmalnik" <kraj(at)servoyant(dot)com>
Subject: Re: Problem with pgstat timeouts
Date: 2012-01-04 18:43:59
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Lists: pgsql-admin
"Benjamin Krajmalnik" <kraj(at)servoyant(dot)com> wrote:
> Default Cache Policy: WriteBack, ReadAhead, Direct, No Write Cache
>   if Bad BBU
> Current Cache Policy: WriteThrough, ReadAhead, Direct, No Write
>   Cache if Bad BBU
> Is it possible that the WriteThrough is what is causing the high
> io (and maybe the pgstat wait timeouts as well)?
> If this is the case, would it be safe to change the cache to Write
> back?
Maybe.  How did it get into this (non-default) state?  Are batteries
installed and healthy?
> Additionally, and somewhat unrelated, is there anything special
> which I need to do when restarting the primary server vis-à-vis
> the streaming replication server?  In other words, if I were to
> restart the main server, will the streaming replication server
> reconnect and pick up once the primary comes online?
I think that should be pretty automatic as long as you haven't
promoted the standby to be the new master.

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