Re: Low Budget Performance
От | Ron Johnson |
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Тема | Re: Low Budget Performance |
Дата | |
Msg-id | 1035925781.11600.42.camel@haggis обсуждение исходный текст |
Ответ на | Re: Low Budget Performance (Andrew Sullivan <andrew@libertyrms.info>) |
Ответы |
Re: Low Budget Performance
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Список | pgsql-performance |
On Tue, 2002-10-29 at 11:31, Andrew Sullivan wrote: > On Tue, Oct 29, 2002 at 09:10:31AM -0800, Josh Berkus wrote: > > > > Out of curiousity, what is it with RAID 5? I've encountered the poor > > write performance too ... any idea why? > > It largely depends on the controller and te implementation. It has > to do with the cost of calculating the checksum. If the > implementation of that is inefficient, the writes become inefficient. A high-quality smart controller with lots of cache RAM definitely negates the RAID5 performance issues. (Of course, I'm referring to enterprise-level rack-mounted h/w that costs big bucks...) -- +------------------------------------------------------------+ | Ron Johnson, Jr. mailto:ron.l.johnson@cox.net | | Jefferson, LA USA http://members.cox.net/ron.l.johnson | | | | "they love our milk and honey, but preach about another | | way of living" | | Merle Haggard, "The Fighting Side Of Me" | +------------------------------------------------------------+
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