Re: Performance :Raid0, 1 fast and 1 slow drive.

1999-09-20 Thread Tim Moore
> The same-ide-channel problem is that you don't get to do that... it's > one at a time, so you'll get something more like an average (harmonic > mean I'd guess... don't make me think :) of the two rates, as over time > you'll be getting data at slow rate, fast rate, slow rate, fast rate, etc > (a

Re: Performance :Raid0, 1 fast and 1 slow drive.

1999-09-19 Thread James Manning
[ Sunday, September 19, 1999 ] Glenn McGrath wrote: > Should the maximum performance of raid0 be twice the speed of the slowest > drive, or the agregate of the two drives speed ? > What speeds are achievable practically? Amdahl's Law :) For separate IDE channels or SCSI, or any other situation w

Performance :Raid0, 1 fast and 1 slow drive.

1999-09-19 Thread Glenn McGrath
Hi, in my current raid setup i have one fast drive (Quantum KA), and one slow drive (Quantum ST). I am not useing the Quantum KA in UDMA mode (old motherboard; PIIX3 controller) but the question is still relavent i believe. Should the maximum performance of raid0 be twice the speed of the slowest