Re: RAID configuration for optimal performance

From: "Mark D. Stock" <mdstock@mydas.freeserve.co.uk> > >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 Nope. 7.24 and Sun, I seem to recall. >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. :-( Amen. It's far too much like hard work to get it configured correctly. > > 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? I'll believe *anything* from a user. I just had this exact same battle with a client who is spending something like '100 million on a new system, yet they're cutting corners on the disk. Idiots. ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com