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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