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BBU still needed with SSD? - Mailing list pgsql-performance

From Andy
Subject BBU still needed with SSD?
Date
Msg-id 1310953399.25726.YahooMailClassic@web111304.mail.gq1.yahoo.com
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Responses Re: BBU still needed with SSD?  (Craig Ringer <craig@postnewspapers.com.au>)
Re: BBU still needed with SSD?  (Yeb Havinga <yebhavinga@gmail.com>)
Re: BBU still needed with SSD?  (Greg Smith <greg@2ndquadrant.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
cacheacts 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
withBBU? What are the pros and cons? 

Thanks.

Andy

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