From: Greg Smith <greg@2ndquadrant.com>
To: Christiaan Willemsen <cwillemsen@technocon.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Using high speed swap to improve performance?
Date: Mon, 05 Apr 2010 10:55:10 -0400
Message-ID: <4BB9F9CE.1020106@2ndquadrant.com> (raw)
In-Reply-To: <vmime.4bb64234.61d6.751839cb97a3e6d@yoda.dhcp.tecnocon.com>
References: <vmime.4bb64234.61d6.751839cb97a3e6d@yoda.dhcp.tecnocon.com>
Christiaan Willemsen wrote:
>
> So I was thinking: Why not make a big fat array using 14 disks (raid
> 1, 10 or 5), and make this a big and fast swap disk. Latency will be
> lower than the SAN can provide, and throughput will also be better,
> and it will relief the SAN from a lot of read iops.
>
Presuming that swap will give predictable performance as things go into
and out of there doesn't sound like a great idea to me. Have you
considered adding that space as a tablespace and setting
temp_tablespaces to point to it? That's the best thing I can think of
to use a faster local disk with lower integrity guarantees for.
--
Greg Smith 2ndQuadrant US Baltimore, MD
PostgreSQL Training, Services and Support
greg@2ndQuadrant.com www.2ndQuadrant.us
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To: pgsql-performance@postgresql.org
Cc: greg@2ndquadrant.com, cwillemsen@technocon.com
Subject: Re: Using high speed swap to improve performance?
In-Reply-To: <4BB9F9CE.1020106@2ndquadrant.com>
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