On 28 Oct 2009, Emmanuel Florac told this: > Le Tue, 27 Oct 2009 16:24:03 -0500 vous écriviez: > >> On a smaller device, such as a Soekris, you are probably better off >> with a hardware RAID controller, as long as it's a good one. > > Building big raid systems is my everyday job; a couple of years ago I > still managed to get 200MB/s from a 450Mhz PIII with 256 MB RAM, which > my most measures should be slower than the Soekris :)
In any case, with two disks you're going to be talking RAID-1, in which your constraint will be bus saturation: and with two disks the bus will be nowhere near saturated. Your constraint will be the disks themselves. (I've done RAID-6 to a degraded six-disk array --- which is pretty much the worst case CPU-usage wise --- with a 600MHz PIII, and at peak write it was using about 15% of the CPU, with Linux md. It takes a really crappy CPU these days before the CPU is the bottleneck. It's bus saturation that RAID controllers are good at stopping...) _______________________________________________ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech
