BBU still needed with SSD?

From: Andy <angelflow(at)yahoo(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: BBU still needed with SSD?
Date: 2011-07-18 01:43:19
Message-ID: 1310953399.25726.YahooMailClassic@web111304.mail.gq1.yahoo.com
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Hi,

Is BBU still needed with SSD?

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.

In this case is BBU still needed? If I put 2 SSD in software RAID 1, would that be any slower than 2 SSD in HW RAID 1 with BBU? What are the pros and cons?

Thanks.

Andy

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