[Elphel-support] Harddrives issues

[jeff witz]

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 :

[root at 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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