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[opensuse] Real World Sata-II disk-to-disk throughput? 77MB/sec is that about right?
Guys,

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, but I have never really thought about what the 'real-world max' should be. I know there are various factors from hardware to number and size of files that impact the rate, but I'm just trying to get an idea if this is reasonable.

The transfer was conducted using about 13 GB (about 1 hr. of video) of data in about 25 files:

15:37 archangel:/dat_e/dv> du -hcs sony/dcrv-1999.0[45].[023][167890]_*
1001M sony/dcrv-1999.04.26_08-29-00.dv
1.5M sony/dcrv-1999.04.26_09-46-11.dv
230M sony/dcrv-1999.04.26_11-24-21.dv
163M sony/dcrv-1999.04.26_12-47-59.dv
1001M sony/dcrv-1999.04.26_15-41-40.dv
1001M sony/dcrv-1999.04.26_15-58-20.dv
362M sony/dcrv-1999.04.26_16-33-49.dv
404M sony/dcrv-1999.04.26_17-50-38.dv
335M sony/dcrv-1999.04.27_02-37-23.dv
331M sony/dcrv-1999.04.27_09-17-43.dv
838M sony/dcrv-1999.04.27_11-15-13.dv
264M sony/dcrv-1999.04.27_14-07-24.dv
229M sony/dcrv-1999.04.27_20-10-51.dv
140M sony/dcrv-1999.04.28_07-36-11.dv
462M sony/dcrv-1999.04.28_08-41-43.dv
1001M sony/dcrv-1999.04.28_10-52-18.dv
584M sony/dcrv-1999.04.28_11-07-26.dv
373M sony/dcrv-1999.04.28_14-50-35.dv
1001M sony/dcrv-1999.04.28_19-47-44.dv
159M sony/dcrv-1999.04.28_20-07-08.dv
206M sony/dcrv-1999.04.29_14-38-06.dv
1001M sony/dcrv-1999.04.29_20-56-26.dv
431M sony/dcrv-1999.04.29_21-18-38.dv
258M sony/dcrv-1999.04.30_22-33-44.dv
546M sony/dcrv-1999.05.01_17-14-07.dv
13G total

The timing of the transfer was:

15:37 archangel:/dat_e/dv> time cp -uav /dat_e/dv/{sony,tape-idx.txt} /dat_f/dv/
`/dat_e/dv/sony/dcrv-1999.04.29_21-18-38.dv' -> `/dat_f/dv/sony/dcrv-1999.04.29_21-18-38.dv'
`/dat_e/dv/sony/dcrv-1999.04.28_14-50-35.dv' -> `/dat_f/dv/sony/dcrv-1999.04.28_14-50-35.dv'
`/dat_e/dv/sony/dcrv-1999.04.29_14-38-06.dv' -> `/dat_f/dv/sony/dcrv-1999.04.29_14-38-06.dv'
`/dat_e/dv/sony/dcrv-1999.04.28_10-52-18.dv' -> `/dat_f/dv/sony/dcrv-1999.04.28_10-52-18.dv'
`/dat_e/dv/sony/dcrv-1999.04.26_15-41-40.dv' -> `/dat_f/dv/sony/dcrv-1999.04.26_15-41-40.dv'
`/dat_e/dv/sony/dcrv-1999.04.28_20-07-08.dv' -> `/dat_f/dv/sony/dcrv-1999.04.28_20-07-08.dv'
`/dat_e/dv/sony/dcrv-1999.04.28_07-36-11.dv' -> `/dat_f/dv/sony/dcrv-1999.04.28_07-36-11.dv'
`/dat_e/dv/sony/dcrv-1999.04.27_11-15-13.dv' -> `/dat_f/dv/sony/dcrv-1999.04.27_11-15-13.dv'
`/dat_e/dv/sony/dcrv-1999.04.26_15-58-20.dv' -> `/dat_f/dv/sony/dcrv-1999.04.26_15-58-20.dv'
`/dat_e/dv/sony/dcrv-1999.04.26_12-47-59.dv' -> `/dat_f/dv/sony/dcrv-1999.04.26_12-47-59.dv'
`/dat_e/dv/sony/dcrv-1999.04.27_09-17-43.dv' -> `/dat_f/dv/sony/dcrv-1999.04.27_09-17-43.dv'
`/dat_e/dv/sony/dcrv-1999.04.29_20-56-26.dv' -> `/dat_f/dv/sony/dcrv-1999.04.29_20-56-26.dv'
`/dat_e/dv/sony/dcrv-1999.05.01_17-14-07.dv' -> `/dat_f/dv/sony/dcrv-1999.05.01_17-14-07.dv'
`/dat_e/dv/sony/dcrv-1999.04.28_19-47-44.dv' -> `/dat_f/dv/sony/dcrv-1999.04.28_19-47-44.dv'
`/dat_e/dv/sony/dcrv-1999.04.28_11-07-26.dv' -> `/dat_f/dv/sony/dcrv-1999.04.28_11-07-26.dv'
`/dat_e/dv/sony/dcrv-1999.04.27_20-10-51.dv' -> `/dat_f/dv/sony/dcrv-1999.04.27_20-10-51.dv'
`/dat_e/dv/sony/dcrv-1999.04.26_17-50-38.dv' -> `/dat_f/dv/sony/dcrv-1999.04.26_17-50-38.dv'
`/dat_e/dv/sony/dcrv-1999.04.28_08-41-43.dv' -> `/dat_f/dv/sony/dcrv-1999.04.28_08-41-43.dv'
`/dat_e/dv/sony/dcrv-1999.04.26_11-24-21.dv' -> `/dat_f/dv/sony/dcrv-1999.04.26_11-24-21.dv'
`/dat_e/dv/sony/dcrv-1999.04.26_16-33-49.dv' -> `/dat_f/dv/sony/dcrv-1999.04.26_16-33-49.dv'
`/dat_e/dv/sony/dcrv-1999.04.27_02-37-23.dv' -> `/dat_f/dv/sony/dcrv-1999.04.27_02-37-23.dv'
`/dat_e/dv/sony/dcrv-1999.04.27_14-07-24.dv' -> `/dat_f/dv/sony/dcrv-1999.04.27_14-07-24.dv'
`/dat_e/dv/sony/dcrv-1999.04.26_09-46-11.dv' -> `/dat_f/dv/sony/dcrv-1999.04.26_09-46-11.dv'
`/dat_e/dv/sony/dcrv-1999.04.26_08-29-00.dv' -> `/dat_f/dv/sony/dcrv-1999.04.26_08-29-00.dv'
`/dat_e/dv/sony/dcrv-1999.04.30_22-33-44.dv' -> `/dat_f/dv/sony/dcrv-1999.04.30_22-33-44.dv'

real 2m47.980s
user 0m0.083s
sys 0m27.982s

What say the experts - reasonable throughput?

--
David C. Rankin, J.D.,P.E.
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