Ken Price wrote:
>
> > 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.
The PERC2/3 cards were junk. These days the PERC 5e and newer
provide performance levels as good or better then Linux software
RAID, plus onboard write-back cache which software RAID doesn't
provide.
-Ross
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