I'm currently experimenting with SCSI RAID 0 merely for fun and also to try to understand some things here that I cant quite understand...
I have a LSI 320-1 (dell PERC4 actually) connected to 3x15k.3 in a hardware RAID 0 setup. I'm using an ampheanol LVD cable with 4 ports (1 empty).
When I use Winbench 99 on this setup, I cant seem to get any good read throughput. It seems to stagnate in the 70-80MB/sec on the whole disk.
If I plug only 1 disk then I can get similar performances, albeit 70MB/sec only on the outer track and 50MB/sec on the inner track.
Plugging the drives in software raid 0 with windows 2003 enterprise give out similar max throughput of 70-80MB/sec.
I'm using a DFI 855GME motherboard with only 1 PCI-X card installed.
I'm wondering if its really the SCSI card that cant handle more IO commands and hence stagnates at 70-80MB/sec or if its something in my setup (cable, motherboard, OS) that is limiting my througput?
I looked at a benchmark here (http://www.tweakers.net/benchdb/testcombo/90) that shows the LSI 320-1 card to be really slow with 4 drives (77MB/sec), and the 320-2X files on the otherhand at 250MB/sec with 4 drives... And dont get me going with SATA, which seem to be able to reach substantial througput with a fraction of the cost... (of course, you loose the low access times...)
Is it me or does the SCSI card make a big difference? In that case would it be better to simply get a good U320 card and simply RAID software (assuming the CPU has cycles to spare)?