From: Josh Berkus <josh@agliodbs.com>
To: pgsql-performance@postgresql.org
Cc: Rémy Beaumont <remyb@medrium.com>
Subject: Re: High load and iowait but no disk access
Date: Tue, 30 Aug 2005 11:32:06 -0700
Message-ID: <200508301132.06904.josh@agliodbs.com> (raw)
In-Reply-To: <bcd92b00545ffeef542f68666144099d@medrium.com>
References: <bcd92b00545ffeef542f68666144099d@medrium.com>
Remy,
> The behavior we see is that when running queries that do random reads
> on disk, IOWAIT goes over 80% and actual disk IO falls to a crawl at a
> throughput bellow 3000kB/s (We usually average 40000 kB/s to 80000 kB/s
> on sequential read operations on the netapps)
This seems pretty low for a NetApp -- you should be able to manage up to
180mb/s, if not higher. Are you sure it's configured correctly?
--
--Josh
Josh Berkus
Aglio Database Solutions
San Francisco
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To: pgsql-performance@postgresql.org
Cc: josh@agliodbs.com, remyb@medrium.com
Subject: Re: High load and iowait but no disk access
In-Reply-To: <200508301132.06904.josh@agliodbs.com>
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