Re: R680 optimisation by Jon Schilling on Jul 6, 2012 at 8:57:23 pm
I double checked with Luis here, I agree he SHOULD be getting those kinds of numbers but he isn't. Looks like he's got the card in the fastest slot he can be in. Maybe it is the iStorage enclosure, not sure. I would imagine the drives he's using are the Standard 2TB Deskstar drives, so that much should be OK. The speeds he indicated he's getting are way too low.
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[Jon Schilling]"Maybe it is the iStorage enclosure, not sure. I would imagine the drives he's using are the Standard 2TB Deskstar drives, so that much should be OK. The speeds he indicated he's getting are way too low."
Four possible problem areas:
- iSPro enclosure
- R680 and its settings
- OS / host system issues
I'd start by breaking the existing RAID set, and clocking several drives individually via R680 to see if the bottleneck is there; then creating a RAID0 with 2-3 drives and seeing what the numbers are; if they are lower than they should be, take a few drives out of the enclosure, insert them into Mac Pro bays, clock them, see if the numbers are different vs. R680/iSPro.
That might give us enough info to see where the problem is.
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Re: R680 optimisation by Nir Shelter on Jul 7, 2012 at 2:30:17 am
Have checked the R680 and raid on a different Macpro not sure what year it was manufactured. For a raid level 6 the disk speed test reached 1200MBs likely it is the host machine having problems with the R680. Am replacing this one on Monday with a different 2010 machine will test the R680/Raid and post the results.
Re: R680 optimisation by Nir Shelter on Jul 10, 2012 at 11:17:26 am
Figured it out was the mini SAS cable after all:
Apparently we were using a type CL2 cable thinner than the usual and when switched to a type CMG cable the thicker type we got through-puts of 1600 MBs raid 0 and 1200+ raid 6.