Re: RAID configuration for optimal performance

Obnoxio The Clown wrote: > > From: Paul Watson <Paul.Watson@gmaccc.co.uk> > > > >Ioannis Demetriades wrote: > > > > > > Does anyone know what type of RAID is proposed by informix? To be more > > > precise, is it possible to achieve the same performance as RAID 1+0 > > > (mirroring + stripping) with RAID 5? > > > >And over to Art:-) Check out the archive at www.iiug.org, this has been > >answered many times. The bottom line don't use RAID 5 > > > > > Is it true that informix suggests that we do not use RAID 5? > > > >Yes > > Actually, and surprisingly, this is not true. The last internal benchmark I > heard of suggested that a well set up, well cached RAID 5 would perform > "competitively" with RAID 10, even on writing (given a potential cost > saving). But there was no attempt to investigate the maintenance of > integrity, which is what gets Art so steamed. Well, Art gets steamed on > write performance, too. :-) Yes, but that was probably the first and last you will see. That was with version 7.1 or similar and DG I think. The trouble with RAID setup is the trouble with RAID setup. It's just too much for most sites to get right. Of course the few that got it right after days of different stripe sizes and configurations are never heard of again. It's only the ones complaining that Informix is slow that you hear from. :-( > Under the circumstances, I am personally *very* reluctant to recommend RAID > 5 on any site I'm involved with. Even if performance is good. And especially > not for cost reasons... Good move. One of the reasons people look at RAID 5 is to save cost. Can you believe it when they just spent millions on a mission critical system? Cheers, -- Mark. +----------------------------------------------------------+-----------+ | Mark D. Stock mailto:mdstock@mydas.freeserve.co.uk |//////// /| | http://www.informix.com http://www.informixhandbook.com |///// / //| | http://www.iiug.org +-----------------------------------+//// / ///| | |What year 2000 bug? year 2000 bug? |/// / ////| | |year 2000 bug? year 2000 bug? year |// / /////| | |2000 bug? year 2000 bug? year 1900 |/ ////////| +----------------------+-----------------------------------+-----------+