Hello, I'm the customer who's bought the four nc353_369_hdd
It seems that the assembly of the cameras was complex due to a problem of sector numbers described here : http://blogs.elphel.com/2010/11/elphel-cameras-and-4096-4k-sector-drives/ I've a blocking issue to discribe : Hardrive issues : Buffer overrun on Elphel 353 N&B, with Sata Drive. First I've tried to bench the disk : [r...@elphel353 /var/hdd]2993# hdparm -Tt /dev/hda /dev/hda: Timing buffer-cache reads: 46 MB in 0.51 seconds = 92234 kB/s Timing buffered disk reads: 33 MB in 3.01 seconds = 11204 kB/s I do not have this problem when using the LAN and Mencoder/Gstreamer to get the movie You can find here different test cases where none of them works. I hope you can help me to solve this issue I have an experiment where that cameras are needed in the second week of Janury. You can find below the results of an afternoon of test. You have the camera configuration and the name of the files, indeed, this name is based on Unix timestamp and there is a new file every buffer overrun. Best Regards. 320x240 90% 310 FPS : Image Resolution: 320 x 240 JPEG Quality: 90 % Framerate: 310.005 fps Data Rate: 3401 Mbit/s | 4.25 MByte/s Buffer overrun ! current datarate exceeds max. write rate Name of the files (because of timestamp) and associed size (Split Size: 900MB, Split Length: 60s): 1293548093_070987.ogm <http://192.168.0.10/hdd/1293548093_070987.ogm> 28 Dec 2010 14:55:08 31.53 MB 1293548108_219494.ogm <http://192.168.0.10/hdd/1293548108_219494.ogm> 28 Dec 2010 14:56:01 183.96 MB 1293548161_365777.ogm <http://192.168.0.10/hdd/1293548161_365777.ogm> 28 Dec 2010 14:56:20 63.15 MB 640x480 90% 127 FPS : Image Resolution: 640 x 480 JPEG Quality : 90 % Framerate : 126.117 fps Data Rate:42.29 Mbit/s | 5.29 Mbyte/s 1293548642_267901.ogm <http://192.168.0.10/hdd/1293548642_267901.ogm> 28 Dec 2010 15:04:08 15.02 MB 1293548648_878886.ogm <http://192.168.0.10/hdd/1293548648_878886.ogm> 28 Dec 2010 15:04:33 120.74 MB Buffer overrun ! current datarate exceeds max. write rate First crash at the beginning, then long time without. 1280x1024 90% 40 FPS : Image Resolution: 1280 x 1024 JPEG Quality: 90 % Framerate: 40.662 fps Data Rate:55.27 Mbit/s | 6.91 MByte/s 1293549049_337245.ogm <http://192.168.0.10/hdd/1293549049_337245.ogm> 28 Dec 2010 15:10:59 47.14 MB 1293549058_970719.ogm <http://192.168.0.10/hdd/1293549058_970719.ogm> 28 Dec 2010 15:11:09 52.04 MB 1293549069_318696.ogm <http://192.168.0.10/hdd/1293549069_318696.ogm> 28 Dec 2010 15:11:18 45.08 MB 1293549078_656514.ogm <http://192.168.0.10/hdd/1293549078_656514.ogm> 28 Dec 2010 15:11:24 24.84 MB 2592x1936 80% 10 FPS : Image Resolution: 2592 x 1936 JPEG Quality : 90 % Framerate : 10.626 fps Data Rate:32.63 Mbit/s | 4.08 MByte/s *File* *Creation Date* *Size* 1293549658_013393.ogm <http://192.168.0.10/hdd/1293549658_013393.ogm> 28 Dec 2010 15:21:09 23.05 MB 1293549669_316305.ogm <http://192.168.0.10/hdd/1293549669_316305.ogm> 28 Dec 2010 15:21:17 9.43 MB 1293549677_228344.ogm <http://192.168.0.10/hdd/1293549677_228344.ogm> 28 Dec 2010 15:21:26 13.61 MB 1293549685_893910.ogm <http://192.168.0.10/hdd/1293549685_893910.ogm> 28 Dec 2010 15:21:35 16.43 MB 1293549695_218813.ogm <http://192.168.0.10/hdd/1293549695_218813.ogm> 28 Dec 2010 15:22:21 153.42 MB 1293549741_560754.ogm <http://192.168.0.10/hdd/1293549741_560754.ogm> 28 Dec 2010 15:23:01 129 MB 1293549781_403521.ogm <http://192.168.0.10/hdd/1293549781_403521.ogm> 28 Dec 2010 15:23:40 126.08 MB 1293549820_492760.ogm <http://192.168.0.10/hdd/1293549820_492760.ogm> 28 Dec 2010 15:23:55 38.05 MB 1293549835_751692.ogm <http://192.168.0.10/hdd/1293549835_751692.ogm> 28 Dec 2010 15:24:01 5.94 MB -- Jean-François WITZ
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