Hello, On Sun, 25 Sep 2011, David C. Rankin wrote:
Copying video between two Seagate ST31500341AS disks with ext3 filesystems I get about 77.8 MB/sec. Given they are supposed to be 300 MB/sec:
"Is the 77 MB/sec close to the real world max I should expect?"
I understand that the 300 MB/sec is the 'theoretical max' throughput,
Those 300 MB/s are what the SATA-II link can theoretically transfer. The fastest drives max out at about 160 MB/s (linear read). Remember, due to sheer physical facts those speeds are only reached in the outermost sectors of the disc. The typical curve over the capacity looks somewhat like this: -----___ ¯¯- where the innermost speed is only about half of the maximum. Also, write speeds are usually slower than read speeds. So, depending on where you read from and write to (and if files need to be fragmented or can be read and written linearly), 77 MB/s (average) is quite good. HTH, -dnh -- $max = [$a => $b] -> [ $a <= $b ]; ## Simon Cozens -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org