----- Message d'origine -----De: Ken Price <[EMAIL PROTECTED]>Date: Mardi, Novembre 13, 2007 11:04 amObjet: Re: [CentOS] Need advice on storageÀ: centos@centos.org> > Thanks Ken.That's a good thing to know that software striping > won't > > really boost performance, i then won't waste money on that > avenue. > > I cannot explain why as i don't know about Linux drivers > > architecture and general system low level behavior but maybe > > somebody on this list could give us a> > It's not specific to Linux, but RAID in general. You need more > than > two disks to get any significant increase in performance. In > fact, > you may get better performance with Linux software RAID than > hardware > RAID. Linux software RAID is really quite robust.> > > clue.As i said on my previous post, i found that the server is > > > inside a rack that has a VTRAK 15100 SCSI to SATA Enclosure > with a > > free SCSI bus (the unit has 2 independant bus) and hard disk > slots. > > I think we have a spare Adaptec 39160 so if it's the case, i > could > > go with this solution and buy 4 x WD 250 Gigs "YS" (RAID) > serie > > drives @ about 75$ each and put all this in RAID 10. The unit > > > supports NCQ. It remains to be seen how well it can perform > even if > > they are talking about "up to 200 MBps".Regards,Guy Boisvert> > I've used both the Promise UltraTrak SX8000 (8-disk RAID50) and > UltraTrak SX4000> (4-disk Raid10). Performance was adequate, but I was using Dell > > PERC2/3 RAID cards. In testing, a plain-jane Adaptec SCSI card > coupled with software RAID gave "significantly" better results.> > Cheers.> -Ken> Hi Ken,Well, i should be OK with my Adaptec 39160 then. I'll see if the VTrak 15100 we have is able to push respectable numbers in RAID 10. But as "[EMAIL PROTECTED]" stated in another post, it will be plugged in a straight 32 bits PCI bus on a crappy mainboard so it's a temporary solution until we get the budget for a new server. But it should be relatively easy to beat a single 200 Gig IDE non NCQ drive!Thanks!Guy Boisvert
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