Am 12.06.2016 um 14:13 schrieb Guy COLIN:
>
> But it has happened yesterday afternoon in 10 minutes I had 87 errors: the
> command "owread uncached" reported: ServerRead: Data error
>
In these cases, you had to check the server log. Which you can do if you
had started the server with logging or --debug. (Please note the pre-3.1
debian packages have all logging disabled in the build due to a
misunderstanding.)
> Restarting owfs and owserver didn't help. Same missing devices after the
> restart.
>
So, a hardware problem.
> Missing devices also miss in their respecting bus listing (uncached/bus.?).
> It's worth to mention that a DS18S20 (10.9702E6010800) that is alone on bus.2
> (Remember my bus master is DS2482-800 i2C->1wire 8 channels) and that is
> directly soldered on the board (hence no cable at all) was also missing!
>
Sure. Any devices can go missing if the bus is jumbled. For example
because of short circuit or a malfunctioning device on the bus.
> Hard reset (power off - on) solved the problem, everything is back after
> reboot.
>
Disconnecting all external devices first did nothing?
>
> I think I now have 2 options to continue troubleshooting:
> -update owfs to 3.1 (I'm still on 2.8p15)
>
You need this for debugging anyways (or you build 2.8p15 from sources.)
> -change bus-master to usb or serial
>
Don't change this yet, please.
> in both cases to see if there is any difference
>
> Worth to mention that another Raspberry Pi (swimming pool sytem) running the
> exact same Raspbian (full read-only) exact same owfs 2.8p15 almost same bus
> master (DS2482 i2C->1wire but 1 channel only) has now an uptime of 210days
> 100% error free. However to be honnest it hasn't always been the case, 1
> year ago this system was also suffering of same randomly disappearing
> devices.
>
On the photo I saw you have an old Raspberry Pi B. Have you updated the
firmware files on that Raspberry (fixup.dat and dtb files, and kernel) ?
I ask that because it could be an I²C problem, too. Earlier firmware
revisions had various bugs.
Kind regards
Jan
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