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From: Greg Smith <greg@2ndquadrant.com>
To: Andy <angelflow@yahoo.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: BBU still needed with SSD?
Date: Mon, 18 Jul 2011 20:39:57 -0400
Message-ID: <4E24D25D.6080809@2ndquadrant.com> (raw)
In-Reply-To: <1310953399.25726.YahooMailClassic@web111304.mail.gq1.yahoo.com>
References: <1310953399.25726.YahooMailClassic@web111304.mail.gq1.yahoo.com>

Andy wrote:
> SSD has its own cache. And in certain models such as Intel 320 that cache is backed by capacitors. So in a sense that cache acts as a BBU that's backed by capacitors instead of batteries. 
>   

Tests I did on the 320 series says it works fine:  
http://archives.postgresql.org/message-id/4D9D1FC3.4020207@2ndQuadrant.com

And there's a larger discussion of this topic at 
http://blog.2ndquadrant.com/en/2011/04/intel-ssd-now-off-the-sherr-sh.html 
that answers this question in a bit more detail.

-- 
Greg Smith   2ndQuadrant US    greg@2ndQuadrant.com   Baltimore, MD

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