On Monday 24 November 2003 14:47, AndyLiebman@aol.com wrote: >> Hmmm, here are some of my thoughts, maybe some of my assumptions are wrong >> as I am no RAID expert. If so, please correct me! >> >> - Maximum FW-Speed = 400Mbit/s, that's with the protocol overhead ~ 35Mb/s >> - Theoretical PCI-Bandwidth: 133 MB/s > > > Do you think this 35 MB/sec applies, even though I am using 5 separate > Firewire PCI cards? That's 5 separate channels, each of which has a 400 > Mbit/sec speed. Keep in mind that EACH drive on the RAID 5 is on it's own > separate PCI card. I already assumed that you use one drive on each channel. Nevertheless, the maximum throughput from a drive to the CPU is limited by the 400Mbit/s Firewire speed, that's around 35Mbyte/s. On a first glance this is no limitation as normal IDE-Drives don't deliver much more than that but the interface speed can be much higher - and that's my point: Transfers from the internal harddisk cache to the CPU are also limited by the firewire speed. Best Regards, Hermann -- x1@aon.at GPG key ID: 299893C7 (on keyservers) FP: 0124 2584 8809 EF2A DBF9 4902 64B4 D16B 2998 93C7 - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
