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Re: Random performance hit, unknown cause.

From: Claudio Freire <klaussfreire(at)gmail(dot)com>
To: Brian Fehrle <brianf(at)consistentstate(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Random performance hit, unknown cause.
Date: 2012-04-12 18:49:43
Message-ID: CAGTBQpZKQiRraki-yuNBycgMz5mZ21wF1cWPKZG8D-3RqGLW2w@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Thu, Apr 12, 2012 at 3:41 PM, Brian Fehrle
<brianf(at)consistentstate(dot)com> wrote:
> This morning, during our nightly backup process (where we grab a copy of the
> data directory), we started having this same issue. The main thing that I
> see in all of these is a high disk wait on the system. When we are
> performing 'well', the %wa from top is usually around 30%, and our load is
> around 12 - 15. This morning we saw a load  21 - 23, and an %wa jumping
> between 60% and 75%.
>
> The top process pretty much at all times is the WAL Sender Process, is this
> normal?

Sounds like vacuum to me.

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Subject: Re: Random performance hit, unknown cause.
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