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RAID 0 performance issues

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December 19, 2011 1:56:27 PM

I recently set up 2 Seagate Barracuda drives (ST3500418AS, ST3500620AS) in RAID 0. The controller is a add on card (UGT-IS100R). Everything seems to be running fine but I am getting some weird numbers when I benchmark the array. The transfer rate is about 140MB/s and is about what I would be getting if the disks were not in RAID but my burst rate seems to be about correct.

a b G Storage
December 19, 2011 2:27:02 PM

That is a fine performance from a RAID 0 for HDD, Regular is about 20-30MB/s(If you transfer file from Same HDD's partition to the other partition)... That HDD performance is twice the performance of a single HDD which is 70MB/s and when you transfer file on the same HDD to the same HDD(Or to other partitions) is usually 20-30MB/s(On one HDD) Transfering file form one HDD to another is about 70MB/s, if add in RAID, it's usually 100-150MB/s
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December 19, 2011 3:01:36 PM

I guess I feel it is a little low as I have another computer running 2 other Barracuda drives in RAID 0 with transfer speeds around 210MB/s, given though they are a different model and running off of MOBO RAID.
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a b G Storage
December 19, 2011 3:36:00 PM

vinjkit said:
I recently set up 2 Seagate Barracuda drives (ST3500418AS, ST3500620AS) in RAID 0. The controller is a add on card (UGT-IS100R).
vinjkit said:
I guess I feel it is a little low as I have another computer running 2 other Barracuda drives in RAID 0 with transfer speeds around 210MB/s, given though they are a different model and running off of MOBO RAID.
The difference in speeds between the two machines may be the result of the add on controller card. Vantec controller cards use software RAID as opposed to a dedicated RAID controller like a 3Ware or Areca RAID card. The Vantec card using software RAID in addition to the overhead put onto the cpu and PCIe bus could result in lower speeds.

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a b G Storage
December 19, 2011 4:02:28 PM

anyway 2 drives in raid don't make it double speed btw ,
but have you noticed how you maintained 150mb/s for 80% of drive test, single drive you would have it curved at 40% and keep going down
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December 19, 2011 6:18:14 PM

Best answer selected by vinjkit.
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