Maurice Hilarius put forth on 1/23/2011 5:18 PM: > On 1/23/2011 2:24 PM, Stan Hoeppner wrote: >> .. >>> Chenbro backplanes do not support 6Gb SAS/SATA. >> Considering no single (mech) drive can push 600 MB/s, let alone 300 MB/s, is >> this really an issue? > Yes. > I have seen it first hand. > If you connect 6GB drives and interfaces to it, you see a lot of errors. > One has to be careful to set all devices to 3GB, assuming the devices have > jumpers or other means to do so. Which chassis model was this? >> Mech drives aren't even going to be surpassing 300 MB/s >> in the foreseeable future. >> > Perhaps, but their buffers do, and if one uses expanders it is useful The _real world_ application performance difference between SATA II and SATA III mech drive interfaces is something on the order of 1%. With SSDs a little more as some of them can actually push data faster than 3 Gb/s. Upstream of an expander the additional b/w is useful, not downstream. -- Stan -- 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
