[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. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
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?"
http://www.barefeats.com/hard78.html Reports speeds similar to yours on a Sata-3G disc. http://blog.testfreaks.com/review/review-of-seagate-2tb-barracuda-xt-sata6-d... Reports 138 MB/s sustained on a Sata-6G disc. I just tried copying 9GB (split about equally over twelve files) from a ST31500341AS (ext3) to ST3500418AS (ext4) and clocked 109 MB/s on average, maybe ext4 is a bit more efficient here. Looks like your drives are doing quite all right. Haro -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
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
"David C. Rankin" <drankinatty@suddenlinkmail.com> wrote:
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. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
David, 3.0 gb/sec is a bus speed. Not a disk read/write speed. I do a lot of disk to disk copies in linear read mode, but I think in terms of GB/min. So 2GB/min is not unusual for a slow laptop drive The fastest I've seen is about 6GB/min. So that's about 100MB/sec. Your speed seems good. Greg -- Sent from my Android phone with K-9 Mail. Please excuse my brevity. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On 09/25/2011 09:45 PM, Greg Freemyer wrote:
David,
3.0 gb/sec is a bus speed. Not a disk read/write speed.
I do a lot of disk to disk copies in linear read mode, but I think in terms of GB/min.
So 2GB/min is not unusual for a slow laptop drive
The fastest I've seen is about 6GB/min. So that's about 100MB/sec.
Your speed seems good.
Greg
David, Greg, Haro, Thanks, that's what I was looking for. Just a quick hack on being in the ball park. I've got no complaints about the throughput I was getting -- darn quick to push 13G from one drive to the other in less that 3 min. But, other than this video stuff, I haven't done much with really large files. Glad to know it looks good :) -- David C. Rankin, J.D.,P.E. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
David C. Rankin wrote:
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?"
That's not bad at all - they're not supposed to be 300MB/s, that's the cable-speed. -- Per Jessen, Zürich (12.6°C) -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On 9/25/2011 4:53 PM, David C. Rankin wrote:
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?
3Gb is just the interface, only the cache on a single drive can even approach that speed. The disk itself even under the ideal theoretical conditions of sequential sustained read from the outer edge of the platters on a high end 15krpm disk and doing a raw read not going through any filesystem overhead, can only reach about 90MB. 77 reading files (not raw data) from one filesystem and writing to files on another filesystem, might not be the absolute highest these drives could attain, there might be some areas of your total system that could be tweaked a little, but it is quite good. To go more than a tiny bit faster you need ssd's or raid. -- bkw -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
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.
The german magazine c't (http://ct.de) just tested the new USB3.0 external 4TB Seagate STAC4000200 GoFlex, which should be about the fastest 3.5", 7.2k min^-1 SATA drive currently available. Sustained reads (min/avg/max): 84 / 138 / 178 MByte/s Sustained writes (min/avg/max): 50 / 101 / 177 MByte/s Problem is, the disk has no fan and after 100 GB or so it gets so hot (63°C) that write speeds go down to 50 MB/s as the disk does a "read after write" when it gets so hot ... HTH, -dnh -- ObReligion: On Mondays, Wednesdays, and Fridays I'm an agnostic. On Tuesdays, Thursdays, and Saturdays I'm an atheist. On Sundays, I just can't make up my mind. -- Robert Allison -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Le 30/09/2011 17:55, David Haller a écrit :
Problem is, the disk has no fan and after 100 GB or so it gets so hot (63°C) that write speeds go down to 50 MB/s as the disk does a "read after write" when it gets so hot ...
this remember me an awfull linux install 10 years ago, with the cd reader stopping 2 mn every 5 mn to cool... nice to see this again :-)))) jdd -- http://www.dodin.net http://www.youtube.com/user/jdddodinorg http://jdd.blip.tv/ -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
participants (7)
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Brian K. White -
David C. Rankin -
David Haller -
Greg Freemyer -
Haro de Grauw -
jdd -
Per Jessen