> After doing a little research, I see that the original slowest form of PCI > was 32 bit 33MHz, with a bandwidth of ~127MB/s. That's still the prevalent form, for anything else you need an (older) server or workstation board. 133MB/s in theory, 80-100MB/s in practice. > The most common hardware used the v2.1 spec, which was 64 bit at 66MHz. I don't think the spec version has anything to do with speed ratings, really. > I would expect operation at UDMA/66 What's UDMA66 got to do with anything? > Final thought, these drives are paired on the master slave of the same > cable, are they? That will cause them to really perform badly. The cables are master-only, I'm pretty sure the controller doesn't even do slaves. To wrap it up - on a regular 32bit/33Mhz PCI bus md-RAID10 is hurt really badly by having to transfer data twice in every case. - the old 3ware 7506-8 doesn't accelerate RAID-10 in any way, even though it's a hardware RAID controller, possibly because it's more of an afterthought. On the 1+0 vs RAID10 debate ... 1+0 = 10 is usually used to mean a stripe of mirrors, while 0+1 = 01 is a less optimal mirror of stripes. The md implementation doesn't really do a stacked raid but with n2 layout the data distribution should be identical to 1+0 / 10. C. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
